Description of problem:

The installer fails on the task:
TASK [openshift_metrics : Applying /tmp/openshift-metrics-ansible-fS4rZe/templates/hawkular-rolebinding.yaml] ***

The error is:
The clusterrolebindings \"hawkular-view\" is invalid: subjects[0].namespace: Required value"

The problem is here:
https://github.com/openshift/openshift-ansible/blob/release-3.9/roles/openshift_metrics/tasks/generate_rolebindings.yaml#L14

There is no namespace in the definition, but the j2 template requires that.

Version-Release number of the following components:
rpm -q openshift-ansible
rpm -q ansible
ansible --version

How reproducible:

Steps to Reproduce:
1.
2.
3.

Actual results:
Please include the entire output from the last TASK line through the end of output if an error is generated

Expected results:

line:
namespace: "{{openshift_metrics_project}}"

In https://github.com/openshift/openshift-ansible/blob/release-3.9/roles/openshift_metrics/tasks/generate_rolebindings.yaml#L14

Additional info:
Please attach logs from ansible-playbook with the -vvv flag