Fix L2pop to not send updates for unrelated networks

With this patch L2 population mechanism driver
sends updates only with ports related to the
network id of the port which is being updated.

(cherry picked from commit de24799696a8199b13223c2ca3820a9ef015bbe0)
Fixes bug: 1240744

Change-Id: If7d51ce26bf0d0837a00da07fe85f48d55e681c6
Merge "Fix L2pop to not send updates for unrelated networks" into stable/havana