Remote buildlets should not be destroyed by the pool implementations for
instances which have been created on clouds. This change adds a check
to ensure that the pool implementations can check for remote buildlets
for instances which are managed by the session pools. Those sessions will
be destroyed by the session pool.

The buildlet client accessors for instance names have been changed so
that they are no longer GCE specific.

The EC2 session pool implementation has been changed so that the
instance name is set in the buildlet client when an EC2 instance is
created.

Updates golang/go#54735
Updates golang/go#54696

Change-Id: Iae3c86cc47b4b79e3287d581dc042dcf2714f7c9
Reviewed-on: https://go-review.googlesource.com/c/build/+/426015
Reviewed-by: Carlos Amedee <carlos@golang.org>
Auto-Submit: Carlos Amedee <carlos@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Run-TryBot: Carlos Amedee <carlos@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>

This change adds a handler which was mistakenly removed. The handler facilitates
local development.

Updates golang/go#54735

Change-Id: Ib1e8ca1ea9a3ee6471192e794975bbd5bf74428e
Reviewed-on: https://go-review.googlesource.com/c/build/+/430695
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Carlos Amedee <carlos@golang.org>
Auto-Submit: Carlos Amedee <carlos@golang.org>
Reviewed-by: Jenny Rakoczy <jenny@golang.org>
Reviewed-by: Carlos Amedee <carlos@golang.org>

This removes the functions which used the depricated gomote API.

Updates golang/go#54735
Updates golang/go#53272

Change-Id: I12d2ce823f140f510186109e2755cca8461a30b4
Reviewed-on: https://go-review.googlesource.com/c/build/+/456044
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Run-TryBot: Carlos Amedee <carlos@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Carlos Amedee <carlos@golang.org>
Auto-Submit: Carlos Amedee <carlos@golang.org>

The new gomote SSH implementation doesn't rely on knowing the user's
GitHub account and its public SSH keys, there's no more need for the
GitHubOfGomoteUser function and its maintenance.

For golang/go#54735.
For golang/go#47521.

Change-Id: Ic35ad254d8cf8bbd0ef652bedbec7e6222bb1cd9
Reviewed-on: https://go-review.googlesource.com/c/build/+/499595
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Carlos Amedee <carlos@golang.org>