This patch implements the implement-ceilometer blueprint.
It addes the necessary role/variables to deploy ceilometer
with a Mongodb backend. The Monogdb backend is assumed to
be up and configured and the playbooks only require a few
values to be set in user_variables to establish a connection.
Change-Id: I2164a1f27f632ce254cc2711ada2c449a9961fed
Implements: blueprint implement-ceilometer
Miguel Cantu