-remove Collectd_Ceilometer folder
-remove Ceilometer specific unit tests
-Remove mentions in devstack, doc, and etc folders
-Substitute refereces of Ceilometer with Gnocchi/Aodh
Closes-Bug: #1710855
Change-Id: I210ca8182c489c4f90a6521b1b7fd6f8a391e602
Signed-off-by: Elizabeth Burke <elizabeth.burke@intel.com>