Description of problem:
After a successful installation of Prometheus service, I run the uninstall operation by add the parameter 'openshift_prometheus_state=absent'  into my inventory file.  Ansible exited during the annotate_serviceaccount operation, however the pod 'prometheus-0' and project 'openshift-metrics' were removed successfully from the instance.  

The error being 'serviceaccounts "prometheus" not found

Version-Release number of selected component (if applicable):


How reproducible:
always,

Steps to Reproduce:
1. install Prometheus successfully
2. try to uninstall by setting openshift_prometheus_state=absent in the inventory file.
3.

Actual results:
    TASK [openshift_prometheus : create prometheus serviceaccount] *****************
          task path: /usr/share/ansible/openshift-ansible/roles/openshift_prometheus/tasks/install_prometheus.yaml:25
          Monday 13 November 2017  21:15:38 +0000 (0:00:01.409)       0:00:27.465 *******
          ok: [host-8-241-75.host.centralci.eng.rdu2.redhat.com] => {"changed": false, "failed": false, "results": {"cmd": "/usr/bin/oc delete sa prometheus -n openshift-metrics", "results": {}, "returncode": 0}, "state": "absent"}
         
          TASK [openshift_prometheus : annotate serviceaccount] **************************
          task path: /usr/share/ansible/openshift-ansible/roles/openshift_prometheus/tasks/install_prometheus.yaml:40
          Monday 13 November 2017  21:15:38 +0000 (0:00:00.812)       0:00:28.278 *******
          fatal: [host-8-241-75.host.centralci.eng.rdu2.redhat.com]: FAILED! => {"changed": true, "cmd": ["oc", "annotate", "--overwrite", "-n", "openshift-metrics", "serviceaccount", "prometheus", "serviceaccounts.openshift.io/oauth-redirectreference.prom={\"kind\":\"OAuthRedirectReference\",\"apiVersion\":\"v1\",\"reference\":{\"kind\":\"Route\",\"name\":\"prometheus\"}}", "serviceaccounts.openshift.io/oauth-redirectreference.alerts={\"kind\":\"OAuthRedirectReference\",\"apiVersion\":\"v1\",\"reference\":{\"kind\":\"Route\",\"name\":\"alerts\"}}"], "delta": "0:00:00.170896", "end": "2017-11-13 16:15:39.364896", "failed": true, "msg": "non-zero return code", "rc": 1, "start": "2017-11-13 16:15:39.194000", "stderr": "Error from server (NotFound): serviceaccounts \"prometheus\" not found", "stderr_lines": ["Error from server (NotFound): serviceaccounts \"prometheus\" not found"], "stdout": "", "stdout_lines": []}
            to retry, use: --limit @/usr/share/ansible/openshift-ansible/playbooks/byo/openshift-cluster/openshift-prometheus.retry
         
          PLAY RECAP *********************************************************************
          host-8-241-75.host.centralci.eng.rdu2.redhat.com : ok=48   changed=4    unreachable=0    failed=1  
          localhost                  : ok=10   changed=0    unreachable=0    failed=0  
         
         
          INSTALLER STATUS ***************************************************************
          Initialization             : Complete
          Prometheus Install         : In Progress
            This phase can be restarted by running: playbooks/byo/openshift-cluster/openshift-prometheus.yml
         
          Monday 13 November 2017  21:15:39 +0000 (0:00:00.431)       0:00:28.709 *******
          ===============================================================================
          openshift_docker_facts : Set docker facts ------------------------------- 4.42s
          /usr/share/ansible/openshift-ansible/roles/openshift_docker_facts/tasks/main.yml:2
          Gather Cluster facts and set is_containerized if needed ----------------- 3.18s
          /usr/share/ansible/openshift-ansible/playbooks/common/openshift-cluster/initialize_facts.yml:126
          Ensure openshift-ansible installer package deps are installed ----------- 1.92s
          /usr/share/ansible/openshift-ansible/playbooks/common/openshift-cluster/initialize_facts.yml:91
          openshift_prometheus : Set alert and prometheus secrets ----------------- 1.41s
          /usr/share/ansible/openshift-ansible/roles/openshift_prometheus/tasks/install_prometheus.yaml:12
          Gathering Facts --------------------------------------------------------- 1.05s
           ------------------------------------------------------------------------------
          openshift_sanitize_inventory : Check for usage of deprecated variables --- 0.91s
          /usr/share/ansible/openshift-ansible/roles/openshift_sanitize_inventory/tasks/deprecations.yml:3
          openshift_prometheus : create prometheus serviceaccount ----------------- 0.81s
          /usr/share/ansible/openshift-ansible/roles/openshift_prometheus/tasks/install_prometheus.yaml:25
          openshift_prometheus : Add prometheus project --------------------------- 0.76s
          /usr/share/ansible/openshift-ansible/roles/openshift_prometheus/tasks/install_prometheus.yaml:4
          Gathering Facts --------------------------------------------------------- 0.74s
           ------------------------------------------------------------------------------
          Gathering Facts --------------------------------------------------------- 0.66s
           ------------------------------------------------------------------------------
          Gathering Facts --------------------------------------------------------- 0.62s
           ------------------------------------------------------------------------------
          Gathering Facts --------------------------------------------------------- 0.61s
           ------------------------------------------------------------------------------
          openshift_repos : refresh cache ----------------------------------------- 0.59s
          /usr/share/ansible/openshift-ansible/roles/openshift_repos/handlers/main.yml:2
          openshift_repos : Ensure libselinux-python is installed ----------------- 0.45s
          /usr/share/ansible/openshift-ansible/roles/openshift_repos/tasks/main.yaml:10 -
          openshift_sanitize_inventory : conditional_set_fact --------------------- 0.44s
          /usr/share/ansible/openshift-ansible/roles/openshift_sanitize_inventory/tasks/__deprecations_logging.yml:5
          openshift_prometheus : annotate serviceaccount -------------------------- 0.43s
          /usr/share/ansible/openshift-ansible/roles/openshift_prometheus/tasks/install_prometheus.yaml:40
          openshift_sanitize_inventory : conditional_set_fact --------------------- 0.37s
          /usr/share/ansible/openshift-ansible/roles/openshift_sanitize_inventory/tasks/__deprecations_metrics.yml:5
          openshift_repos : Remove openshift_additional.repo file ----------------- 0.36s
          /usr/share/ansible/openshift-ansible/roles/openshift_repos/tasks/main.yaml:13 -
          Detecting Operating System from ostree_booted --------------------------- 0.32s
          /usr/share/ansible/openshift-ansible/playbooks/common/openshift-cluster/initialize_facts.yml:20
          openshift_prometheus : Create templates subdirectory -------------------- 0.26s
          /usr/share/ansible/openshift-ansible/roles/openshift_prometheus/tasks/main.yaml:16
          command terminated with exit code 2


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