Remove driver validation on node update

As discussed in the meeting on 14 Oct 2013, remove driver validation
when driver_info is changed.

Change-Id: Icca14742740b99d27a36d4dd315bb49d570cdeb2
Closes-Bug: #1237650
Remove unused class/file

This file seems not being used by Ironic at all.

Change-Id: I79a033d529baeb302d5baf1beb5bcb701c34315f
Removes stubs from unit tests

self.stubs in TestCase and BaseTestCase classes use moxstubout
module which uses mox. OpenStack is moving to python 3 which
will not support mox. This patch removes the use of self.stubs
for all the unit test cases.

Change-Id: I0e5aa50edcbb1913c5143bb93efea965f5d5ebfb
Merge "Remove driver validation on node update"
Merge "Remove unused class/file"