BUG-1167: missing Notification of FLOW_REMOVED

- added propagation of switchFlowRemoved notification

Change-Id: I9edf2ebe52fc919c0e986cbe4f58e80a352eda8b
Signed-off-by: Michal Rehak <mirehak@cisco.com>
Merge "BUG-1167: missing Notification of FLOW_REMOVED"