addedd region_name to keystone, nova, neutron and cinder to support...

addedd region_name to keystone, nova, neutron and cinder to support distributed cloud for Wind River Titanium cloud and StarlingX

Change-Id: Ic04f35f668f485674760af3805f0a70e4d180477
Signed-off-by: fatollahy <masoud.fatollahy@windriver.com>