catalyze.py didn't work from outside of source dir.

Due to a bug in the Python script, catalyze.py didn't work when pointing to a
source dir. Fixed that.

Change-Id: I087a735b79d8d19ff7ef9faa34f62349a3c0c165
Merge topic 'catalyst_2.0' into next

1483657 catalyze.py didn't work from outside of source dir.