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The default tunnel server domain is switched to ua5v.com and, as a
protocol change, "cable." is prepended. The latter makes using a CNAME
easier because CNAMEs can't exist at a zone cut. (I.e. ua5v.com itself
cannot be a CNAME because it must have an SOA record, but cable.ua5v.com
could be a CNAME.)

BUG=1002262

Change-Id: Ia2a69ffab82f0ef065b813ffee58f16ca02bcf28
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2463808
Commit-Queue: Adam Langley <agl@chromium.org>
Reviewed-by: Martin Kreichgauer <martinkr@google.com>
Cr-Commit-Position: refs/heads/master@{#816686}