Fix and enable H303 and F403  No wildcard (*) import.

F403 is related the message is:
F403 'from bla import *' used; unable to detect undefined names

Change-Id: I486c0b2fc15a616e3fdf1e7e2eaeae1e45075537
Merge "Fix and enable H303 and F403  No wildcard (*) import."
Adding common base class for Rackspace Resource providers

Change-Id: If7d15e01c53fb6db4bdee5759b0ef4f087640c58
Merge branch 'master' into bp-dev/rackspace-cloud-servers-provider

Conflicts:
	heat/db/sqlalchemy/models.py

Change-Id: I662b10d94e9b00f07ad2cb55dcd6854051a85f6e
Merge commit 'refs/changes/61/32961/8' of https://review.openstack.org/openstack/heat into bp-dev/rackspace-cloud-servers-provider

Conflicts:
	heat/engine/resources/rackspace/rackspace_resource.py

Change-Id: I0e84a6d8304986da968c8e8ecdd877d54a5f4a6b