Remove unused VR_FLOW_FLAG_TRAP_ECMP
Remove unused VR_FLOW_FLAG_TRAP_ECMP

VR_FLOW_FLAG_TRAP_ECMP is not used in VROUTER, removing
the usage of the same to allow re-using the flags bit

Related-Bug: 1597540
Change-Id: I8941895a8a5b202e5b2ffa54c3a70a0fc2fc9dfc
(cherry picked from commit bd230eb30844fefe980e58d2ac05cb86b26307c2)

codilime/contrail-controller,codilime/contrail-controller,codilime/contrail-controller,codilime/contrail-controller,codilime/contrail-controller,codilime/contrail-controller