Correct memory leak in the RTE cleanup

When cleaning up a route table entry the round robin group
block (rrg) was not being correctly freed. The leak was small,
but would be noticed in a situation described by the indicated
issue (many table updates).

Issue-ID: RIC-674

Signed-off-by: E. Scott Daniels <daniels@research.att.com>
Change-Id: Ica7d0219574abd33392c7127f918ac71b2891702
Signed-off-by: E. Scott Daniels <daniels@research.att.com>
8 files changed