Fix describe_groupsfix-describe-groups

This was completely broken previously because it didn't lookup the group
coordinator of the consumer group. Also added basic error
handling/raising.

Note:
I added the `group_coordinator_id` as an optional kwarg. As best I
can tell, the Java client doesn't include this and instead looks it up
every time. However, if we add this, it allows the caller the
flexibility to bypass the network round trip of the lookup if for some
reason they already know the `group_coordinator_id`.

0 files changed, 0 insertions, 0 deletions