Revert of Use classic GAE for coordinator default frontend.

Revert of Use classic GAE for coordinator default frontend. (patchset #2 id:20001 of https://codereview.chromium.org/2591443002/ )

Reason for revert:
This works! But doing this through socket API is measurably slower:

Logs for 6MB responses:
Classic: 12s, 12s

MVM: 1.9s, 2, 2, 2.1s

Original issue's description:
> Use classic GAE for coordinator default frontend.
> 
> Now that AppEngine sockets API is default-integrated into gRPC calls, we
> no longer need to run on a Managed VM in order to perform HTTP2
> connections to BigTable. Since classic scales better (ATM), let's switch
> to that.
> 
> BUG=None
> TEST=dev
> R=vadimsh@chromium.org
> 
> Review-Url: https://codereview.chromium.org/2591443002
> Committed: https://github.com/luci/luci-go/commit/bde0f949595b702559b9c96be85a0d405ffad1f2

TBR=vadimsh@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=None

Review-Url: https://codereview.chromium.org/2590263002
Committed: https://github.com/luci/luci-go/commit/31a0a28a8808261ee63d6c2d9fb22c726f70c6db

[dnj, 2016-12-20 16:00:36]

The CQ bit was checked by dnj@chromium.org

[dnj, 2016-12-20 16:00:37]

Created Revert of Use classic GAE for coordinator default frontend.

[commit-bot: I haz the power, 2016-12-20 16:00:45]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-12-20 16:00:51]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1482249636860210, "parent_rev":
"4130c9e1b7634770b25394ced45a5a3e8ad281f2", "commit_rev":
"31a0a28a8808261ee63d6c2d9fb22c726f70c6db"}

[commit-bot: I haz the power, 2016-12-20 16:00:55]

Description was changed from

==========
Revert of Use classic GAE for coordinator default frontend. (patchset #2
id:20001 of https://codereview.chromium.org/2591443002/ )

Reason for revert:
This works! But doing this through socket API is measurably slower:

Logs for 6MB responses:
Classic: 12s, 12s

MVM: 1.9s, 2, 2, 2.1s

Original issue's description:
> Use classic GAE for coordinator default frontend.
> 
> Now that AppEngine sockets API is default-integrated into gRPC calls, we
> no longer need to run on a Managed VM in order to perform HTTP2
> connections to BigTable. Since classic scales better (ATM), let's switch
> to that.
> 
> BUG=None
> TEST=dev
> R=vadimsh@chromium.org
> 
> Review-Url: https://codereview.chromium.org/2591443002
> Committed:
https://github.com/luci/luci-go/commit/bde0f949595b702559b9c96be85a0d405ffad1f2

TBR=vadimsh@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=None
==========

to

==========
Revert of Use classic GAE for coordinator default frontend. (patchset #2
id:20001 of https://codereview.chromium.org/2591443002/ )

Reason for revert:
This works! But doing this through socket API is measurably slower:

Logs for 6MB responses:
Classic: 12s, 12s

MVM: 1.9s, 2, 2, 2.1s

Original issue's description:
> Use classic GAE for coordinator default frontend.
> 
> Now that AppEngine sockets API is default-integrated into gRPC calls, we
> no longer need to run on a Managed VM in order to perform HTTP2
> connections to BigTable. Since classic scales better (ATM), let's switch
> to that.
> 
> BUG=None
> TEST=dev
> R=vadimsh@chromium.org
> 
> Review-Url: https://codereview.chromium.org/2591443002
> Committed:
https://github.com/luci/luci-go/commit/bde0f949595b702559b9c96be85a0d405ffad1f2

TBR=vadimsh@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=None

Review-Url: https://codereview.chromium.org/2590263002
Committed:
https://github.com/luci/luci-go/commit/31a0a28a8808261ee63d6c2d9fb22c726f70c6db
==========

[commit-bot: I haz the power, 2016-12-20 16:00:56]

Committed patchset #1 (id:1) as
https://github.com/luci/luci-go/commit/31a0a28a8808261ee63d6c2d9fb22c726f70c6db

[Vadim Sh., 2016-12-20 20:40:43]

On 2016/12/20 16:00:56, commit-bot: I haz the power wrote:
> Committed patchset #1 (id:1) as
>
https://github.com/luci/luci-go/commit/31a0a28a8808261ee63d6c2d9fb22c726f70c6db

lgtm

:'(