Fixing problem importing other scripts in the main Catalyst script.

Introduced an issue where a Catalyst Python script trying to import
another Python script in the same directory was causing problems.
This was introduced with trying to make importing Python scripts
more efficient in parallel by having proc 0 being the only one
that reads the file.

Change-Id: I516d14ce949170babd7108e61b22705251efdea1
Merge topic '14998_catalyst_fix_PYTHONPATH' into next

5491f6d7 Fixing problem importing other scripts in the main Catalyst script.