Merge pull request #144 from pulp/rbarlow_workaround_github

Replace all live http:// tests in test_distributions.py with file:// tes...
Remove a non-deterministic unit test that downloaded 13 MB.

We will write a much better test when we write the new Yum Importer
plugins.
Remove an unnecceary test path from rpm_support_base.py.
Merge branch 'rbarlow_test_drpms_file_scheme'