Received notifications context is not a DesignateContext
Received notifications context is not a DesignateContext

Nova/Neutron's notifcations context contains fields which we do not
know how to handle in DesignateContext. We should treat received
context's as simple dict's rather than attempting to munge into
a DesignateContext.

Change-Id: Ieda187679171333be69e98d6301c64a14187a5d7
Closes-Bug: 1360696

melodous/designate,openstack/designate,melodous/designate,tonyli71/designate,cneill/designate,kiall/designate-py3,cneill/designate-testing,cneill/designate,grahamhayes/designate,muraliselva10/designate,ramsateesh/designate,kiall/designate-py3,ionrock/designate,grahamhayes/designate,melodous/designate,ionrock/designate,ionrock/designate,openstack/designate,muraliselva10/designate,muraliselva10/designate,kiall/designate-py3,tonyli71/designate,kiall/designate-py3,kiall/designate-py3,cneill/designate,grahamhayes/designate,ramsateesh/designate,cneill/designate-testing,openstack/designate,cneill/designate-testing,tonyli71/designate,melodous/designate,cneill/designate,ramsateesh/designate,cneill/designate