Description of problem:
In the inventory file, set openshift_metrics_heapster_standalone=True, this should only deploy heapseter, but Cassandra and Hawkular Metrics is installed.

Version-Release number of selected component (if applicable):
OCP 3.5

How reproducible:
always

Steps to Reproduce:
1.prepare inventory file

[oo_first_master]
$MASTER ansible_user=root ansible_ssh_user=root ansible_ssh_private_key_file="/root/.ssh/libra.pem" openshift_public_hostname=$MASTER

[oo_first_master:vars]
deployment_type=openshift-enterprise
openshift_release=v3.5.0

openshift_metrics_install_metrics=true

openshift_metrics_hawkular_hostname=hawkular-metrics.$SUBDOMAIN
openshift_metrics_project=openshift-infra


openshift_metrics_image_prefix=registry.ops.openshift.com/openshift3/
openshift_metrics_image_version=3.5.0

openshift_metrics_heapster_standalone=True

2.# ansible-playbook  -vvv  -i  ~/inventory  playbooks/common/openshift-cluster/openshift_metrics.yml

Actual results:
#oc get pod -n openshift-infra
NAME                         READY     STATUS    RESTARTS   AGE
hawkular-cassandra-1-lfh47   1/1       Running   0          11m
hawkular-metrics-t54ws       1/1       Running   0          11m
heapster-s89dv               1/1       Running   0          11m


Expected results:
Should only deploy heapster

Additional info:
Ansible log is attached.