Log methods using rpc communcation

In Icehouse was used rpc library from oslo-incubator. Because the code
wasn't mature enough it was running in DEBUG mode. After migrating to
oslo.messaging we don't need to have debug level in oslo.messaging but
it's good to have communication logged.

Closes-Bug: #1340696
Change-Id: I4f68545053912f96affc1bbcd64fcd7efe8d18c0
Merge "Log methods using rpc communcation"