Fix APIVersion.__getnewargs__

``__getnewargs__()`` must return a tuple.

Fixes ``E0312(invalid-getnewargs-returned), APIVersion.__getnewargs__]
 __getnewargs__ does not return a tuple)``.

Signed-off-by: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>
Reviewed-By: Rob Crittenden <rcritten@redhat.com>

ipapython/ipautil.py

@@ -1580,7 +1580,7 @@ class APIVersion(tuple):
         return "<APIVersion('{}.{}')>".format(*self)
 
     def __getnewargs__(self):
-        return str(self)
+        return (str(self),)
 
     @property
     def major(self):