Fix username/name issue in tower_user module, update test playbook

awx_collection/tests/integration/targets/tower_user/tasks/main.yml

@@ -1,10 +1,20 @@
 ---
 - name: Create a User
   tower_user:
-    first_name: Joe
-    last_name: User
     username: joe
+    first_name: Joe
     password: "{{ 65535 | random | to_uuid }}"
+    state: present
+  register: result
+
+- assert:
+    that:
+      - "result is changed"
+
+- name: Change a User
+  tower_user:
+    username: joe
+    last_name: User
     email: joe@example.org
     state: present
   register: result
@@ -13,6 +23,17 @@
     that:
       - "result is changed"
 
+- name: Check idempotency
+  tower_user:
+    username: joe
+    first_name: Joe
+    last_name: User
+  register: result
+
+- assert:
+    that:
+      - "result is not changed"
+
 - name: Delete a User
   tower_user:
     username: joe