Add support for region_name and interface for client connection
Add support for region_name and interface for client connection

Change-Id: I16aa9fc49221e26727676030c1a052b2c6b743ef
Related-Bug: #1744190

stackforge/python-senlinclient,openstack/python-senlinclient,stackforge/python-senlinclient,openstack/python-senlinclient