log.py:  Fixed a bug where users with unicode characters in their UPN would throw Unicode*Error exceptions.  This should close issue #332 (https://github.com/liftoff/GateOne/issues/332).
ssh_connect.py:  Fixed a bug where you could get encoding-related exceptions if a user's UPN contained unicode characters.
utils.py:  Fixed a bug in `cmd_var_swap()` where you could get encoding-related exceptions if one of the swapped variables contained unicode characters.
termio.py:  Fixed a bug where you could get encoding-related exceptions if an environment variable contained unicode characters.