Standalone servers for keepalive and receiver

 - added supervisor sections for assassind and receiverd
 - keepalive renamed to assasin (name conflicts) and starts as separate process controlled by supervisor
 - RPC receiver moved to separate server

NOTICE: depends on https://review.openstack.org/#/c/72325/

Change-Id: Ib7c74a2b3304cdb5a7c4dbaa57bcbf776b80dcfa
Implements: blueprint nailgun-move-to-uwsgi
Merge "Standalone servers for keepalive and receiver"
Restrict programname matching in puppet.log to puppet-apply

Change-Id: I59370bcb847fa07f06b92b6e99c19939d422d65e
Closes-bug: #1280488
Tune mysql, galera, sqlalchemy backend settings

- Tune mysql+galera settings
- Tune SQLAlchemy backend settings for Openstack

Closes-bug: #1274784
Implements blueprint: optimize-db-performance-at-scale

Change-Id: I0e843022f04f53150da52858280034aad6aee987
Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>