Updated openstack/openstack
Project: openstack/neutron  e95347be1409154062a59b0a720c75d0e0d7cd2b

tests/unit: refactor reading neutron.conf.test

neutron.conf.test includes rpc_backend whose value is stashed.
Thus it is required to reset when tearing down, otherwise the stale status
will be used by succeeding tests causing random error.

This patch refactors reading neutron.conf.test and resets the status of
rpc_backend properly.

Closes-Bug: #1281481
Closes-Bug: #1284549
Change-Id: I0fa5945b6adbb9945d353028ec88d00ccbf4e31a