Check requested image size

Add a sanity check to the prepare() method in the PXE driver to check
if check if the requested image to be deployed is larger than the root
partition size.

Closes-Bug: #1288007
Change-Id: I5d80b147a330aee2df237b4a1b82e2c6e990f148
Clean up openstack-common.conf

This patch clean up openstack-common.conf:
 * remove unused module sslutils
 * add missing module versionutils in openstack-common.conf

Change-Id: Ibf36a9e5507dcae3209227b563cc3ef566d976cd
Updated from global requirements

Change-Id: I7627967effc9a147efc614ef83d1ad9040818063
Corrects a typo in RESTful Web API (v1) document

The typo /v1/nodes/<uuid>/state is changed to /v1/nodes/<uuid>/states
Closes-Bug: 1311285

Change-Id: I66bc695298c04b423c9c9be45b23fce5b60727f0
Merge "Clean up openstack-common.conf"
Merge "Check requested image size"
Merge "Corrects a typo in RESTful Web API (v1) document"
Cleanup mock patch without `with` part 1

A good idea because it makes the code easier to read to get rid of
the `with` using mock.patch and mock.patch.object in favor decorators,
where possible in the tests.

This patch only affects drivers.

Change-Id: I564428a6315352f72ad3bad69bf7dd8cd88ffd9e
Merge "Updated from global requirements"