Bump Ceph default version to Quincy in cephadm deploy
Bump Ceph default version to Quincy in cephadm deploy

Latest Ceph stable version is Quincy. This patch set
sets Quincy as default for the cephadm deploy.
This change won't have an impact in the script being
currently used in our CI.

Change-Id: I2d87ec0e93853cd0852944b30a87f6127f491550

openstack/devstack-plugin-ceph