LogDog: Use gRPC credential directly.

LogDog: Use gRPC credential directly.

Previously, LogDog used an HTTP client with a token source to connect to
BigTable, which uses gRPC. This broke at some point and now returns an
error. Replace this with the proper direct gRPC credentials.

TBR=vadimsh@chromium.org
BUG=chromium:648278
- Deployed on production system, no longer encounters HTTP error and
    can successfully pull from BigTable.

Committed: https://github.com/luci/luci-go/commit/e6e5673e8aa0a8e930ac3fcd693e671a6f8a71c1

[dnj, 2016-09-19 16:21:28]

The CQ bit was checked by dnj@chromium.org

[commit-bot: I haz the power, 2016-09-19 16:21:33]

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

[dnj, 2016-09-19 16:21:59]

The CQ bit was unchecked by dnj@chromium.org

[dnj, 2016-09-19 16:22:06]

Description was changed from

==========
LogDog: Use gRPC credential directly.

Previously, LogDog used an HTTP client with a token source to connect to
BigTable, which uses gRPC. This broke at some point and now returns an
error. Replace this with the proper direct gRPC credentials.

TBR=vadimsh@chromium.org
BUG=chromium:648153
TEST=prod
  - Deployed on production system, no longer encounters HTTP error and
    can successfully pull from BigTable.
==========

to

==========
LogDog: Use gRPC credential directly.

Previously, LogDog used an HTTP client with a token source to connect to
BigTable, which uses gRPC. This broke at some point and now returns an
error. Replace this with the proper direct gRPC credentials.

TBR=vadimsh@chromium.org
BUG=chromium:648278
  - Deployed on production system, no longer encounters HTTP error and
    can successfully pull from BigTable.
==========

[dnj, 2016-09-19 16:22:12]

The CQ bit was checked by dnj@chromium.org

[commit-bot: I haz the power, 2016-09-19 16:22:23]

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, 2016-09-19 16:31:21]

Description was changed from

==========
LogDog: Use gRPC credential directly.

Previously, LogDog used an HTTP client with a token source to connect to
BigTable, which uses gRPC. This broke at some point and now returns an
error. Replace this with the proper direct gRPC credentials.

TBR=vadimsh@chromium.org
BUG=chromium:648278
  - Deployed on production system, no longer encounters HTTP error and
    can successfully pull from BigTable.
==========

to

==========
LogDog: Use gRPC credential directly.

Previously, LogDog used an HTTP client with a token source to connect to
BigTable, which uses gRPC. This broke at some point and now returns an
error. Replace this with the proper direct gRPC credentials.

TBR=vadimsh@chromium.org
BUG=chromium:648278
  - Deployed on production system, no longer encounters HTTP error and
    can successfully pull from BigTable.

Committed:
https://github.com/luci/luci-go/commit/e6e5673e8aa0a8e930ac3fcd693e671a6f8a71c1
==========

[commit-bot: I haz the power, 2016-09-19 16:31:26]

Committed patchset #1 (id:1) as
https://github.com/luci/luci-go/commit/e6e5673e8aa0a8e930ac3fcd693e671a6f8a71c1

[Vadim Sh., 2016-09-19 18:00:22]

lgtm

I wonder why it broke...

[dnj, 2016-09-19 18:10:32]

On 2016/09/19 18:00:22, Vadim Sh. wrote:
> lgtm
> 
> I wonder why it broke...

I haven't deployed in the last 1.5 months, so probably BigTable or Google Client
API update disallowed direct HTTP client supplying.