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

test/integration/targets/tower_role/aliases

@@ -0,0 +1,2 @@
+cloud/tower
+posix/ci/cloud/group4/tower

test/integration/targets/tower_role/tasks/main.yml

@@ -0,0 +1,39 @@
+- name: Create a User
+  tower_user:
+    first_name: Joe
+    last_name: User
+    username: joe
+    password: "{{ 65535 | random | to_uuid }}"
+    email: joe@example.org
+    state: present
+  register: result
+
+- assert:
+    that:
+      - "result is changed"
+
+- name: Add Joe to the update role of the default Project
+  tower_role:
+    user: joe
+    role: update
+    project: Demo Project
+    state: "{{ item }}"
+  register: result
+  with_items:
+    - "present"
+    - "absent"
+
+- assert:
+    that:
+      - "result is changed"
+
+- name: Delete a User
+  tower_user:
+    username: joe
+    email: joe@example.org
+    state: absent
+  register: result
+
+- assert:
+    that:
+      - "result is changed"