* src/net.c (SYS_FUNC(socket), decode_sockname, SYS_FUNC(accept4),
SYS_FUNC(send), SYS_FUNC(sendto), SYS_FUNC(recv), SYS_FUNC(recvfrom),
do_pipe, SYS_FUNC(socketpair), print_sockopt_fd_level_name,
print_get_error, SYS_FUNC(getsockopt), SYS_FUNC(setsockopt)): Use
tprints_arg_begin, tprint_arg_next, tprint_arg_end,
tprint_indirect_begin, tprint_indirect_end, tprint_value_changed,
PRINT_VAL_D, and PRINT_VAL_U.
* tests/sockname.c (test_sockname_syscall): Update expected output
by printing " => " instead of "->" in cases of changed socklen.
* tests/net-y-unix.c (main): Likewise.
* tests/net-yy-unix.c (main): Likewise.
* tests/so_linger.c (main): Likewise.
* tests/so_peercred.c (main): Likewise.
* tests/sock_filter-v.c (main): Likewise.
* tests/sockopt-sol_netlink.c (main): Likewise.
* tests/net.expected: Likewise.
* tests/sun_path.expected: Likewise.