1100805 - Fixing consumer group bind and unbind and moving tasks from ta...

...sks/consumer_group.py to consumer group cud manager

https://bugzilla.redhat.com/show_bug.cgi?id=1100805
Forming the tuple inside of the method call is easy to misread the tuple for a list of parameters. It would be better to form the tuple on a line above, that way the function call is clear that there is one parameter, and it is a tuple.