add some Tower module integration tests (and fix a bug or two) (#37421)

* add additional test coverage for tower modules

* add test coverage for the tower_credential module

* add test coverage for the tower_user module

* fix a bug in py3 for tower_credential when ssh_key_data is specified

* add test coverage for tower_host, tower_label, and tower_project

* add test coverage for tower_inventory and tower_job_template

* add more test coverage for tower modules

- tower_job_launch
- tower_job_list
- tower_job_wait
- tower_job_cancel

* add a check mode/version assertion for tower module integration tests

* add test coverage for the tower_role module

* add test coverage for the tower_group module

* add more integration test edge cases for various tower modules

* give the job_wait module more time before failing

* randomize passwords in the tower_user and tower_group tests

lib/ansible/modules/web_infrastructure/ansible_tower/tower_role.py

@@ -87,6 +87,10 @@ def update_resources(module, p):
     by name using their unique field (identity)
     '''
     params = p.copy()
+    for key in p:
+        if key.startswith('tower_'):
+            params.pop(key)
+    params.pop('state', None)
     identity_map = {
         'user': 'username',
         'team': 'name',