Implement container-cluster aware capacity determination

* Added two settings values for declaring absolute cpu and memory
  capacity that will be picked up by the capacity utility methods
* installer inventory variables for controlling the amount of cpu and
  memory container requests/limits for the awx task containers
* Added fixed values for cpu and memory container requests for other
  containers
* configmap uses the declared inventory variables to define the
  capacity inputs that will be used by AWX to correspond to the same
  inputs for requests/limits on the deployment.

installer/openshift/templates/deployment.yml.j2

@@ -21,6 +21,10 @@ spec:
           volumeMounts:
             - mountPath: /etc/tower
               name: awx-application-config
+          resources:
+            requests:
+              memory: "1Gi"
+              cpu: "500m"
         - name: awx-celery
           image: {{ awx_task_openshift_image }}
           imagePullPolicy: Always
@@ -46,6 +50,13 @@ spec:
               value: {{ default_admin_user|default('admin') }}
             - name: AWX_ADMIN_PASSWORD
               value: {{ default_admin_password|default('password') }}
+          resources:
+            requests:
+              memory: "{{ awx_task_cpu_request|default('2') }}Gi"
+              cpu: "{{ awx_task_mem_request|default('1500') }}m"
+            limit:
+              memory: "{{ awx_task_cpu_request|default('2') }}Gi"
+              cpu: "{{ awx_task_mem_request|default('1500') }}m"
         - name: awx-rabbit
           image: ansible/awx_rabbitmq:{{ rabbitmq_version }}
           imagePullPolicy: Always
@@ -81,8 +92,16 @@ spec:
               value: "awx"
             - name: RABBITMQ_CONFIG_FILE
               value: "/etc/rabbitmq/rabbitmq"
+          resources:
+            requests:
+              memory: "2Gi"
+              cpu: "500m"
         - name: awx-memcached
           image: memcached
+          resources:
+            requests:
+              memory: "1Gi"
+              cpu: "500m"
       volumes:
         - name: awx-application-config
           configMap: