[acm distrib core].c: Print locking errors to syslog

Double opening for ibssa log causes problems. It may damage
existing log file. Usually reason for file locking problems is
an old running instance of the same application. We have to keep
the log valid.

Path to system log can be found in /etc/rsyslog.conf

Signed-off-by: Sasha Kotchubievsky <sashakot@mellanox.com>
Signed-off-by: Hal Rosenstock <hal@mellanox.com>