Update oslo.policy to 1.27.0
Update oslo.policy to 1.27.0

Change-Id: I477c5e98e71b4cbe5c9928d7acb1333aeef9c908
Depends-on: I67af55943abdb98b8b97a917390b1a3670463a25

openstack/rpm-packaging,openstack/rpm-packaging