Ceph should never be deployed with an even number of monitors.

Signed-off-by: JuanJose 'JJ' Galvez <jj.galvez@inktank.com>
Merge pull request #30 from jgalvez/pull-req-release-roxy-master-5458bf315d94064341d4731918096a43df5e57ae

Check for odd number of ceph-mon in proposal [2/2]