Disable mockprogram.py and gitdist tests on travis-ci (TriBITS #45)

For some reason that I can't understand, when run on the travic-ci sever, it
can't find the mockprogram.py script.  Since this test is running on a VM that
I can't log onto myself to debug, it is nearly imposible to debug this issue.
Therefore, I am just disbaling these two tests.  I don't really care if these
unit tests (or gitdist for that matter) runs in the travis-ci env becuase no
one will ever develop there.

After pushing TriBITS to Trilinos I find that these tests fail on other
platforms as well, I will look into this.

This commit also contains the revert of:

Revert "Add debug print of mockprogram.py path (TriBITS #45)"

This reverts commit b70a451113e686c6077e98656187c314da860257.