Invert modules.conf logic

Rather then autoloading everything, we explicitly load what we need.  I
find this give the user better control of what is installed by default.

Additionally, upstream (my) puppet modules will likely expect this.

Change-Id: Ib572c54053bd5b5f9a3a513f6f8696db87ea0864
Signed-off-by: Paul Belanger <paul.belanger@polybeacon.com>
Merge "Invert modules.conf logic"