hbacsvc: Use IPAAnsibleModule method to validate arguments.

Use the IPAAnsibleModule.params_fail_if_used method to validate
arguments provided by user.

plugins/modules/ipahbacsvc.py

@@ -127,6 +127,7 @@ def main():
 
     # Check parameters
 
+    invalid = []
     if state == "present":
         if len(names) != 1:
             ansible_module.fail_json(
@@ -137,11 +138,8 @@ def main():
             ansible_module.fail_json(
                 msg="No name given.")
         invalid = ["description"]
-        for x in invalid:
-            if vars()[x] is not None:
-                ansible_module.fail_json(
-                    msg="Argument '%s' can not be used with state '%s'" %
-                    (x, state))
+
+    ansible_module.params_fail_used_invalid(invalid, state)
 
     # Init