Now all OpenStack resource classes inherit CloudResource
that provides getRegion method and regionName property.
This allows to assign resources to different regions.
getRegion() returns CloudRegion instance that resource or it
parent belong to. CloudRegion has the similar interface to
Environment class and is the correct way to get HeatStack
instance associated with the regoin, default network
configuration, security group manager and agent listener
instances. Environment acts as the default region so backward
compatibility is not broken. However new applications
should not use environment to set security group rules but
rather a region(s) of their instance(s) in order to work correctly
when their instances were configured to use region other then
the default.
Change-Id: I4dbf40c65042e9a354f3bfadfcd63a63e6e3e418
bb2d0e5a84