Remove unnecessary log system

Remove unnecessary log system

If the execv() call fails, there used to be a feature that uses a socket to
send the error message to the launchpad.
This feature is no longer needed. The stderr file descriptor is redirected to
dlog, so we can check error logs using dlog.

Change-Id: I36ad6d690361bba01dce2df065e5caa8d22fab5b
Signed-off-by: Hwankyu Jhun <h.jhun@samsung.com>