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 ceph health nagios plugin for testing.

Added custom function to convert netmask to cidr.

Added appropriate hiera entries in common.yaml.