4.4BSD snapshot (revision 8.1); add 1993 to copyright

4.4BSD snapshot (revision 8.1); add 1993 to copyright

SCCS-vsn: lib/libc/net/byteorder.3 8.1
SCCS-vsn: lib/libc/net/gethostbyname.3 8.1
SCCS-vsn: lib/libc/net/gethostnamadr.c 8.1
SCCS-vsn: lib/libc/net/getnetbyaddr.c 8.1
SCCS-vsn: lib/libc/net/getnetbyname.c 8.1
SCCS-vsn: lib/libc/net/getnetent.3 8.1
SCCS-vsn: lib/libc/net/getnetent.c 8.1
SCCS-vsn: lib/libc/net/getproto.c 8.1
SCCS-vsn: lib/libc/net/getprotoent.3 8.1
SCCS-vsn: lib/libc/net/getprotoent.c 8.1
SCCS-vsn: lib/libc/net/getprotoname.c 8.1
SCCS-vsn: lib/libc/net/getservbyname.c 8.1
SCCS-vsn: lib/libc/net/getservbyport.c 8.1
SCCS-vsn: lib/libc/net/getservent.3 8.1
SCCS-vsn: lib/libc/net/getservent.c 8.1
SCCS-vsn: lib/libc/net/herror.c 8.1
SCCS-vsn: lib/libc/net/inet.3 8.1
SCCS-vsn: lib/libc/net/inet_addr.c 8.1
SCCS-vsn: lib/libc/net/inet_lnaof.c 8.1
SCCS-vsn: lib/libc/net/inet_makeaddr.c 8.1
SCCS-vsn: lib/libc/net/inet_netof.c 8.1
SCCS-vsn: lib/libc/net/inet_network.c 8.1
SCCS-vsn: lib/libc/net/inet_ntoa.c 8.1
SCCS-vsn: lib/libc/net/iso_addr.3 8.1
SCCS-vsn: lib/libc/net/iso_addr.c 8.1
SCCS-vsn: lib/libc/net/linkaddr.3 8.1
SCCS-vsn: lib/libc/net/linkaddr.c 8.1
SCCS-vsn: lib/libc/net/ns.3 8.1
SCCS-vsn: lib/libc/net/ns_addr.c 8.1
SCCS-vsn: lib/libc/net/ns_ntoa.c 8.1
SCCS-vsn: lib/libc/net/rcmd.3 8.1
SCCS-vsn: lib/libc/net/rcmd.c 8.1
SCCS-vsn: lib/libc/net/recv.c 8.1
SCCS-vsn: lib/libc/net/res_comp.c 8.1
SCCS-vsn: lib/libc/net/res_debug.c 8.1
SCCS-vsn: lib/libc/net/res_init.c 8.1
SCCS-vsn: lib/libc/net/res_mkquery.c 8.1
SCCS-vsn: lib/libc/net/res_query.c 8.1
SCCS-vsn: lib/libc/net/res_send.c 8.1
SCCS-vsn: lib/libc/net/resolver.3 8.1
SCCS-vsn: lib/libc/net/send.c 8.1
SCCS-vsn: lib/libc/net/sethostent.c 8.1