Correct a possible DNSService connection leak
Correct a possible DNSService connection leak

There was a potential codepath where, if after parsing
a packet, an exception was raused, we may leave TCP sockets
around without explicitly closing them

Change-Id: I6d619d05c7d0250cb5ae55212129e0d849c66c9d

cneill/designate-testing,ramsateesh/designate,grahamhayes/designate,cneill/designate-testing,muraliselva10/designate,muraliselva10/designate,ramsateesh/designate,grahamhayes/designate,cneill/designate-testing,openstack/designate,ramsateesh/designate,muraliselva10/designate,openstack/designate,grahamhayes/designate,openstack/designate