Clean imports in code
Clean imports in code

This patch set modifies lines which are importing objects
instead of modules. As per openstack import guide lines, user should
import modules in a file not objects.

http://docs.openstack.org/developer/hacking/#imports

Change-Id: I188257e8b678ccf8fa9d43d32832b574becb0cf7

openstack/python-aodhclient