* configure.in: Check svctcp_socket and svcudp_socket.
* configure: Regenerated.
* support/include/config.h.in (HAVE_SVCTCP_SOCKET): New.
(HAVE_SVCUDP_SOCKET): New.
* support/include/nfslib.h (svctcp_socket): New.
(svcudp_socket): New.
* support/nfs/Makefile (OBJS): Add svc_socket.o.
* support/nfs/svc_socket.c: New.
* support/nfs/rpcmisc.c (rpc_init): Call svctcp_socket and
svcudp_socket if port is unspecified.
* utils/nfsd/nfsd.c (main): Call getservbyname for port.
* utils/rquotad/rquota_svc.c: Include <nfslib.h>.
(killer): New. Signal handler to unregister.
(main): Use killer. Call svcudp_socket to get the default
socket.