Add git commit info to VDD

There have been many times looking at test results that I've wonder with what
commit the version of VDD being run was built.  This change adds that
information to VDD.  Now, when --version is passed, the commit hash is also
printed.  Additionally, the VDD git commit hash is also printed at the start
of each test's log file.  This should help with debugging down the road.

Testing done:

VDD --version and ran a few tests to check for commit info.