Threading pt3:

Threading pt3:

* Only external change here is to healthcheck the rmr thread as part of a1s healthcheck. k8s will now respin a1 if that is failing.
* Refactors (simplifies) how we wait for rmr initialization; it is now called as part of __init__
* Refactors (simplifies) how the thread is actually launched; it is now internal to the object and also a part of __init__
* Cleans up unit testing; a1rmr now exposes a replace_rcv_func; useful for unit testing, harmless if not called otherwise
* Upgrades to rmr-python 1.0.0 for simpler message allocation

Change-Id: I7106f8f35e94ba1c638d782609974bf4d4ba7c22
Signed-off-by: Tommy Carpenter <tc677g@att.com>