RFC 6125 now specifies that wildcards are only allowed for the leftmost
label in a pattern: https://tools.ietf.org/html/rfc6125#section-6.4.3.

This change updates Go to match the behaviour of major browsers in this
respect.

Fixes #9834.

Change-Id: I37c10a35177133624568f2e0cf2767533926b04a
Reviewed-on: https://go-review.googlesource.com/5691Reviewed-by: Andrew Gerrand <adg@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>