v15.2.12 Octopus released

This is a hotfix release addressing a number of security issues and regressions. We recommend all users update to this release. For a detailed release notes with links & changelog please refer to the official blog entry at https://ceph.io/releases/v15-2-12-octopus-released Getting Ceph ------------ * Git at git://github.com/ceph/ceph.git * Tarball at https://download.ceph.com/tarballs/ceph-15.2.12.tar.gz * For packages, see https://docs.ceph.com/docs/master/install/get-packages/ * Release git sha1: ce065eabfa5ce81323b009786bdf5bb03127cbe1