fix: correct failure conditions for user creation to cover all cases

tasks/oracle/create_db_users.yml

@@ -17,9 +17,9 @@
     state: present
   register: db_user
   failed_when:
-    - "db_user.rc != 0"
     # Ignore this error, because usually, the Oracle DB user has running pro-
     # cesses and cannot be changed while the DB is running.
+    - "db_user.msg is defined"
     - "'is currently used by process' not in db_user.msg"
 
 # The DB user doesn't actually use this dir, but it's nice for admins to put