Bug 2435 - Controller/MD-SAL throwing ModifiedNodeDoesNotExistException exception when statistics manager
augment queue statistics to the node connector. Exception was thrown because parent (queue) container was
not present when statistics manager tried to augment statistics. Fixed the issue by creating empty queue
container and 'merge'ing it to the node connector before augmenting the statistics.

Signed-off-by: Anil Vishnoi <vishnoianil@gmail.com>
Change-Id: I7d68f3e177ccf62c7adf154e655226450a74296c
Merge "Bug 2435 - Controller/MD-SAL throwing ModifiedNodeDoesNotExistException exception when statistics manager augment queue statistics to the node connector. Exception was thrown because parent (queue) container was not present when statistics manager tried to augment statistics. Fixed the issue by creating empty queue container and 'merge'ing it to the node connector before augmenting the statistics." into stable/helium