The format_exc method does not take an exception
The format_exc method does not take an exception

For py35, this call blows up.  Seems to be ignored for py27, but
even in py27, it doesn't take an exception.

https://docs.python.org/2.7/library/traceback.html
https://docs.python.org/3/library/traceback.html

Change-Id: I2602426b966045b15b96e5e41d0df6524ed05119

dtroyer/osc-lib