fix metrics become syntax

roles/openshift_metrics/tasks/main.yaml

@@ -23,7 +23,8 @@
   local_action: command mktemp -d
   register: local_tmp
   changed_when: False
-  become: false
+  vars:
+    ansible_become: false
 
 - name: Copy the admin client config(s)
   command: >
@@ -48,4 +49,5 @@
   tags: metrics_cleanup
   changed_when: False
   check_mode: no
-  become: false
+  vars:
+    ansible_become: false