Currently in cluster deploy, ceph image points to ceph/ceph:v14.2.1-20190430.
Changing this to use ceph/daemon-base:latest-nautilus-devel as its the latest nautilus.

Ceph nautilus has some changes in cephsfs mgr module, which is required by ceph-csi
canary image, without which the create/purge of RWX PVCs will fail. These changes
are not yet part of any released ceph version, i.e v14.2.1-20190430. Even in the
short future, we expect some changes to land in Nautilus after 14.2.2, hence
waiting for 14.2.2 release and updating to it, will not solve the issue.
Therefore using latest-nautilus-devel, which will always have the changes
required by ceph-csi. This is only a temperory change in the master, until
14.2.3 is released.
Signed-off-by: Poornima G <pgurusid@redhat.com>