Code tag file is not available

[tcmitchell]

After transition we're seeing these messages in pairs in the chapi.log file:

Cannot read code tag file '/etc/geni-chapi/geni-chapi-githash'.
Can't find code tag file /etc/geni-chapi/geni-chapi-githash

In the GPO Lab we had a hack that would write the git hash to that file. Now that we install via RPM that is no longer the case. Come up with a replacement solution that will allow get_info to return a code tag and update date. See tools/chapi_utils.py .