Added ceph manifests to rjil.

rjil::ceph
  This class Install ceph and does basic configuration,
    which need to be added for both ceph servers and clients

rjil::ceph::mon
  This class setup ceph mon - this only need to be call on ceph mon nodes

rjil::ceph::osd
  This class setup ceph osds.

Added appropriate hiera entries in common.yaml.
the command itself check if the memory fragmentatino is there and if flush the cahses only if required. 
If required we can split the command in two - one to check if the memory is fragmented (in only_if )
flush cache (command). Please let me know what you think.