Bump up Ceph to Pacific and Ganesha to v3.5
Bump up Ceph to Pacific and Ganesha to v3.5

This will change the version of Ceph from Octopus to Pacific and,
with it, the version of Ganesha from v3.3 to v3.5 which is the
version shipped into the Ceph Pacific container.

Change-Id: I1b31ef9dd13e1d56284f8d9f8be03e3fee0eb0a7

openstack/devstack-plugin-ceph