Update version parameter format in SpdyAltSvcWireFormat.

Update version parameter format in SpdyAltSvcWireFormat.

Update version parameter of alternative services to a quotation mark enclosed,
comma separated list of positive integers (from a single naked integer).  Also
place it at the end of the list both as a member and when serialized.  This
makes sense because it is an experimental parameter (as opposed to, for example,
max-age, which is serialized first).  It was following port previously for more
efficient packing, but now that it's a vector, that became moot.

This CL lands server change 106303839 by bnc.

BUG=392575
Committed: https://crrev.com/50767a82f2be8f62f9d20f2add7f602130e0a305
Cr-Commit-Position: refs/heads/master@{#356300}

[Bence, 2015-10-27 13:19:34]

bnc@chromium.org changed reviewers:
+ rch@chromium.org

[Bence, 2015-10-27 13:19:34]

Ryan: PTAL.  Thank you.

[Ryan Hamilton, 2015-10-27 13:49:45]

lgtm

[Bence, 2015-10-27 14:16:00]

The CQ bit was checked by bnc@chromium.org

[commit-bot: I haz the power, 2015-10-27 14:16:16]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1410343005/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1410343005/1

[commit-bot: I haz the power, 2015-10-27 15:24:29]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-27 15:25:24]

Patchset 1 (id:??) landed as
https://crrev.com/50767a82f2be8f62f9d20f2add7f602130e0a305
Cr-Commit-Position: refs/heads/master@{#356300}