Add an option to specify container capabilities for the redis container

With some kubernetes clusters and settings, you might need to specify
some capabilities so the container can start. For example, the CHOWN,
SETUID and SETGID capabilties.
Setting the redis_capabilities option will add the capabilities in
the deployment.

config/crd/bases/awx.ansible.com_awxs.yaml

@@ -292,6 +292,11 @@ spec:
                 redis_image_version:
                   description: Redis container image version to use
                   type: string
+                redis_capabilities:
+                  description: Redis container capabilities
+                  type: array
+                  items:
+                    type: string
                 init_container_image:
                   description: Registry path to the init container to use
                   type: string