shellcheck: contrib/dist/suse/tor.sh.in issues

In contrib/dist/suse/tor.sh.in line 29:
. /etc/rc.status
  ^------------^ SC1091: Not following: /etc/rc.status was not specified as input (see shellcheck -x).


In contrib/dist/suse/tor.sh.in line 44:
ulimit -n 8192
       ^-- SC2039: In POSIX sh, ulimit -n is undefined.


In contrib/dist/suse/tor.sh.in line 65:
    SUPROG=/bin/su
    ^----^ SC2034: SUPROG appears unused. Verify use (or export if used externally).


In contrib/dist/suse/tor.sh.in line 115:
    RETVAL=1
    ^----^ SC2034: RETVAL appears unused. Verify use (or export if used externally).

For more information:
  https://www.shellcheck.net/wiki/SC2034 -- RETVAL appears unused. Verify use...
  https://www.shellcheck.net/wiki/SC2039 -- In POSIX sh, ulimit -n is undefin...
  https://www.shellcheck.net/wiki/SC1091 -- Not following: /etc/rc.status was...