Add ssl options for ceilometer rabbitmq connection

Adds overcloud configuration options for ceilometer rabbitmq ssl port and
connection config using a shared rabbitmq parameter.

Relies on: I7b7613cb60b9095ba5665c335c496fea4514391a
Change-Id: Ibc641d7bd0899da8b14cc897065ae9cd186930c4
Merge "Add ssl options for ceilometer rabbitmq connection"