net: skip new testpoint TestUDPIPVersionReadMsg on plan9
Skip TestUDPIPVersionReadMsg on plan9, since it does things
not supported on that OS.
Change-Id: Icd1716fb5ed4e8877e57acb8c851ec3be72e83e2
Reviewed-on: https://go-review.googlesource.com/c/go/+/363354 Reviewed-by: Jason A. Donenfeld <Jason@zx2c4.com>
Trust: Jason A. Donenfeld <Jason@zx2c4.com>
Trust: Than McIntosh <thanm@google.com>
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Go Bot <gobot@golang.org>