mash patches to make blacklist/whitelist configurable (followup)

[Ralph Bean]

Following up here on two patches that were:

- posted in a ticket in April https://bugzilla.redhat.com/show_bug.cgi?id=1082832
- mailed to this list in July https://lists.fedoraproject.org/pipermail/rel-eng/2014-July/018149.html

I've rebased them again to be sure they cleanly apply against the master branch
of the mash repo.

If there's anything I can do to modify them to make them acceptable or if I
need to deliver them in some other way, please let me know.

 mash/__init__.py | 18 ++++++++++--------
 mash/config.py   | 14 ++++++++++++++
 mash/multilib.py | 40 +++++++++++++++++++---------------------
 3 files changed, 43 insertions(+), 29 deletions(-)