sync policy logging fix from incubator

This change syncs in a delete of an extremely verbose tight loop
debug message in policy.py that generated 8 additional lines for
every wsgi call.

Changes:

238e601b Make policy debug logging less verbose
9c88dc31 file_open: fixed docstring to refer to open() instead of file()

Change-Id: Ifd3f139ebabec9db4a645cd092a810ab22f5085e
Merge "sync policy logging fix from incubator"