orchestrate-devstack: Copy controller ceph.conf and keyrings to subnode

This change introduces a basic role to copy the contents of /etc/ceph
between the controller and subnodes during orchestrate-devstack allowing
a multinode ceph job to be introduced by
I9ffdff44a3ad42ebdf26ab72e24dfe3b12b1ef8b.

Note that this role is only used when devstack-plugin-ceph is enabled.

Change-Id: I324c0f35db34f8540ca164bf8c6e3dea67c5b1b4
3 files changed