Revert "grouper: use own kernel"

This reverts commit 5d946b91d4bc3ad1141684d30a38b4a7946c7d4c.

Change-Id: I13e692480fe8fa4fc9bfb14b8e6d24ccb792f3b4
Merge "Revert "grouper: use own kernel"" into lp5.0