Fixed issue when running facade-worker.py from different directory.
Fixed issue when running facade-worker.py from different directory.

Facade would not properly cache changed gitdm config files if run from a
different directory.  This change ensures that facade-worker.py is aware what
directory the script lives in, and chooses the right relative path for the
cached files.

Signed-off-by: Brian Warner <760e7dab2836853c63805033e514668301fa9c47@bdwarner.com>

mkdolan/facade,brianwarner/facade,mkdolan/facade,brianwarner/facade,brianwarner/facade,mkdolan/facade