Delete stale port-chain db entry
Delete stale port-chain db entry

Cleans stale port-chain db entry. The failure in create port-chain
code path was not getting completed due to missing argument
in raising exception.

Change-Id: I2d9d0dbfe2496288e5590e3382848bdb40b96989
Closes-Bug: #1670650

openstack/networking-sfc,openstack/networking-sfc