pep8 cleanup of Nova code

For various reasons, the Nova code in the Ironic tree is not covered by
the pep8 check.  This is a manual pass and cleanup of the scheduler
and driver code until this merges into Nova and can be gated on pep8
coverage again.

Change-Id: I1ab114c4bd152992262b1de8e763b407e92ca69f
Merge "pep8 cleanup of Nova code"