Fixed use of local_ip general setting in scripts

Ignore-this: ff2b0668a14b18b9d9bc4362d846e737

darcs-hash:20090818134837-1e3d8-9089c102e7219ba71b151b19f41f29431587a77d
Made sip.local_ip general setting non-nillable

Ignore-this: 7601a7b36453aedc40cc8d9a240de56b

darcs-hash:20090818142440-1e3d8-c3a810d5f966e9df257cc32c8f51d2df2ccc1512