Description of problem:
./roles/openshift_metrics/README.md states that:

`The following variables need to be set and will be validated:

- `openshift_metrics_hawkular_hostname`: hostname used on the hawkular metrics route.

- `openshift_metrics_project`: project (i.e. namespace) where the components will be
  deployed.`


Setting `openshift_metrics_project` to anything other than the default of `openshift-infra`, however, causes the installation to fail during the
`./roles/openshift_metrics/tasks/pre_install.yaml` playbook with the message:

`Cannot get annotations on {{ openshift_metrics_project }} namespace`

where `{{ openshift_metrics_project }}` is the redefined name.  This appears to be due to the fact that there is not a play that creates a newly defined `openshift_metrics_project` namespace.  `openshift-infra` is created by default in other plays.

Version-Release number of the following components:

rpm -q openshift-ansible
openshift-ansible-3.11.104-1.git.0.379a011.el7.noarch

rpm -q ansible                                                                                                                           
ansible-2.6.14-1.el7ae.noarch

ansible --version
ansible 2.6.14
  config file = /root/openshift-cluster-311-lab/ansible.cfg
  configured module search path = [u'/root/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python2.7/site-packages/ansible
  executable location = /bin/ansible
  python version = 2.7.5 (default, Jun 11 2019, 12:19:05) [GCC 4.8.5 20150623 (Red Hat 4.8.5-36)]

How reproducible: Always

Steps to Reproduce:
1.  define an OSEv3 variable `openshift_metrics_project=openshift-metrics`
2. run installer.
3. fails

Actual results:
Cannot get annotations on openshift-metrics namespace

Expected results:
Functioning cluster with metrics installed.