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Updates golang/go#29988
Updates golang/go#27205

Change-Id: Ib1443d14a6369322b36cdf8305344a35c421a2e5
Reviewed-on: https://go-review.googlesource.com/c/160377
Reviewed-by: Agniva De Sarker <agniva.quicksilver@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

…shortlink creation

There's a new dedicated issue tracking this task, point to it instead
of the previous large issue which has been closed by now.

Updates golang/go#29988
Updates golang/go#27205

Change-Id: Ib1443d14a6369322b36cdf8305344a35c421a2e5
Reviewed-on: https://go-review.googlesource.com/c/160377
Reviewed-by: Agniva De Sarker <agniva.quicksilver@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
(cherry picked from commit 1c35819)
Reviewed-on: https://go-review.googlesource.com/c/160477
Reviewed-by: Andrew Bonventre <andybons@golang.org>
Run-TryBot: Andrew Bonventre <andybons@golang.org>

Works around golang/go#29988.

This change re-enables the /s/ link shortener admin interface,
running as its own App Engine service on the go111 runtime,
which still supports the “login: admin” option in app.yaml.

+ The golangorg build constraint on the internal/memcache and
  internal/short packages is removed to allow easy import
+ A new function, AdminHandler is introduced in the short package
  to allow for registering the handler outside of it
+ Some page cleanup to leverage modern HTML and JS capabilities,
  obviating the need for jQuery, which has been removed
+ Clients for Redis and Cloud Datastore have been updated to
  the latest versions

Fixes golang/go#29988

Change-Id: If6ca75e85e16a7d86bb5dafcf08b27d2dc36f530
Reviewed-on: https://go-review.googlesource.com/c/website/+/238545
Run-TryBot: Andrew Bonventre <andybons@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>