volser: Use unsigned addresses and volume IDs

volser: Use unsigned addresses and volume IDs

Fix code and header files in src/volser that use afs_int32 for server
IP addresses instead of afs_uint32 (the worst offenders being UV_*
functions). Also fix an instance of afs_int32 being used for a volume
ID, and remove 'struct volser_dest' instead of fixing it, since it is
completely unused.

Change-Id: I1008ed158855c2a22b4605b5a037f5e68731529e
Reviewed-on: http://gerrit.openafs.org/2249
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>