Use oslo.msg retry API in rpc publisher

This patch removes the ceilometer hack around rabbitmq configuration
to use the oslo.messaging API to retry rpc connection.

Closes bug #1244698
Co-Authored-By: Ala Rezmerita <ala.rezmerita@cloudwatt.com>

Change-Id: I162f2ce7ba7f6644d995dfeef8b0ef5e2727c226
Merge "Use oslo.msg retry API in rpc publisher"