ensure correct logging calls

[chdsbd]

# incorrect
logging.info("Login error for %s, %s", (user_id, name))

# correct
logging.info("Login error for %s, %s", user_id, name)

[sbdchd]

Another thing to check for:

logging.info("foo %s%", "bar")
# raises ValueError: incomplete format

log.warning("foo bar buzz", 10)
# TypeError: not all arguments converted during string formatting
# Message: 'foo bar buzz'
# Arguments: (10,)