Updated openstack/openstack
Project: openstack/neutron  6a589e73fb206e8520519c5d57d81629d60631f1

Fix AttributeError in RPC code for DVR

Fix the usage of call methods as per recent changes according to
drop-rpc-compat. These changes went overlooked and it broke DVR.

Tests will be done as follow-up.

Partial-bug: #1394848

Change-Id: I6e0584f8e54e606a76b87853b2371cc8e24eba69