fix memory leak produced by 'corosync -v'

Signed-off-by: zouyu <hopkings2005@gmail.com>
Reviewed-by: Jan Friesse <jfriesse@redhat.com>
Handle SIGSEGV and SIGABRT signals

SIGSEGV and SIGABRT signals are now correctly handled (blackbox is
dumped and logsys is finalized).

Signed-off-by: zouyu <hopkings2005@gmail.com>
Reviewed-by: Jan Friesse <jfriesse@redhat.com>