Fix or disable pylint warnings for inconsistent return.

In some places, disabling the warnings rather than fixing it required
less changes, without compromising readability.

plugins/modules/ipahostgroup.py

@@ -157,8 +157,8 @@ def find_hostgroup(module, name):
             msg="There is more than one hostgroup '%s'" % (name))
     elif len(_result["result"]) == 1:
         return _result["result"][0]
-    else:
-        return None
+
+    return None
 
 
 def gen_args(description, nomembers, rename):