Release 4.2.0

Changes:
 - Added option to configure libvirt service name via class parameters
 - Added support for multiple SSL APIs
 - Added option to configure os_region_name in the nova config
 - Corrected resource dependencies on the nova user
 - Fixed os version fact comparison for RedHat-based operating systems
   for specifying service provider
 - Fixed ssl parameter requirements when using kombu and rabbit
 - Added class for extended logging options

Change-Id: I38c5f6a40efe905cf5bf78ddf07008a56ac0ac1f