Bug 1760 - Removing redudant call to writeFlow in L3ForwardingService

Change-Id: I5e95352ab5990e442b967fcd9845ea22b770afaf
Signed-off-by: Madhu Venugopal <mavenugo@gmail.com>
Merge "Bug 1760 - Removing redudant call to writeFlow in L3ForwardingService"