Identifier "syslog" is unintendedly reassigned in _setup_logging_from_conf()
with OSSysLogHandler.
It causes an error in _find_facility() which expects "syslog" as module.
This change fixes the problem.
Change-Id: Icd8486bc008028f6f78f0306d835bf2c4fb9245b
Closes-Bug: #1499620