Optional tower cli (#3)

* Allow running tests without tower_cli

* patch up test mutability

* Fix test import error, warning mock

* flake8 error

Update documentation for non-converted modules

awx_collection/plugins/modules/tower_job_wait.py

@@ -42,6 +42,10 @@ options:
       description:
         - Maximum time in seconds to wait for a job to finish.
       type: int
+
+requirements:
+- ansible-tower-cli >= 3.0.2
+
 extends_documentation_fragment: awx.awx.auth
 '''