set SUBSYS to init.d script name instead of rc?.d link name

Variable $SUBSYS used the scriptname from rc?.d directory e.g. 'S96obiee' instead of 'obiee' from init.d.

This prevents a OBIEE shutdown on runlevel 0 since the main rc script expects an lock file named after the init.d script.

Please notice: The log file names in /var/log will change too by this commit.