"sb2": a small change to debug messages
"sb2": a small change to debug messages

- when debugging is active, print $SBOX_SESSION_DIR in the beginning
  (and don't print $SBOX_LUA_SCRIPTS)

OlegGirko/ldbox,h113331pp/scratchbox2,h113331pp/scratchbox2,h113331pp/scratchbox2,ldbox/ldbox,ldbox/ldbox,h113331pp/scratchbox2,ldbox/ldbox,OlegGirko/ldbox,OlegGirko/ldbox,OlegGirko/ldbox,OlegGirko/ldbox,ldbox/ldbox,h113331pp/scratchbox2,OlegGirko/ldbox,h113331pp/scratchbox2,ldbox/ldbox,ldbox/ldbox