Common format and log level for invalid path
Common format and log level for invalid path

Referencing the wrong file or path is a common user error (or breach
attempt).  Let's use LOG_INFO for these types of event, i.e., op has
to run with `-l info` to see them in log.  Also, standardize format
of message to include user address and command.

Signed-off-by: Joachim Nilsson <583c295fd7602c168ad814279bbc3894ba65f5d6@gmail.com>

troglobit/uftpd,troglobit/uftpd