Updated openstack/openstack
Project: openstack/neutron  15c431807168e7d2a772fefb065bad467b7a8be1
null
Fixes Hyper-V port metrics enabling after service restart

(cherry picked from commit 492190aae01b6587be9e4280a819e2d5a1fdbf97)

Closes-Bug: #1263766
Change-Id: I48fb5389b6049641ca2649990e81e94e4c45ef7f