RXAFSCB_GetCellServDB takes a serverList not an array of afs_int32

RXAFSCB_GetCellServDB takes a serverList not an array of afs_int32

Reported by Marcus Watts

ListCellsRPC calls RXAFSCB_GetCellServDB which takes a serverList
and not an array of afs_int32.  Add the serverList and copy the
resulting server addresses into the array of afs_int32 address
values.

Include afs/afscbint.h instead of afs/afsint.h in order to obtain
prototypes for RXAFSCB_ functions.

Reviewed-on: http://gerrit.openafs.org/89
Verified-by: Russ Allbery <rra@stanford.edu>
Reviewed-by: Russ Allbery <rra@stanford.edu>