Make ubik use unsigned addresses

Make ubik use unsigned addresses

The ubik code currently treats IPv4 addresses as both signed and
unsigned 32-bit ints. Make some instances use unsigned ints to make ubik
more consistent and squash a couple of warnings.

Note that this slightly alters the signatures of the public ubik
functions ubeacon_InitServerListByInfo, ubeacon_InitServerList,
ubik_ServerInitByInfo, ubik_ServerInit, ubik_ParseClientList, and
ubik_ParseServerList, to use unsigned addresses.

Change-Id: I27b6170d4de0080bf66d51a6b5332e65685ddef8
Reviewed-on: http://gerrit.openafs.org/875
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>