[cinder][stable-maint] July releases from the stable branches

I've posted release patches for the stable branches: https://review.openstack.org/#/q/topic:cinderproject-july-2019 Notes on what is/isn't being released are on the etherpad: https://etherpad.openstack.org/p/cinder-releases-tracking I have a question about the semver for the cinder stable/stein release; it's noted on the patch: https://review.opendev.org/669771 cheers, brian