When troubleshooting problems with cluster it would be
very convenient to have information about agent heartbeats
logged with some searchable identifier which could create
1-to-1 mapping between events in agent's logs and server's logs.
Currently agent's heartbeats are not logged at all on server side.
Since on a large cluster that could create too much logging
(even for troubleshooting cases), it might make sense to make
this configurable both on neutron-server side and on agent-side.
DocImpact
Change-Id: I0a127ef274a84bba5de47395d47b62f48bd4be16
Closes-Bug: #1452582
e50e1a2369