Fix LogDog client queries without state.

Fix LogDog client queries without state.

LogDog is allowed to issue queries without retrieving state. However,
the client library considered a lack of state an error. Update it to
permit this.

Update Milo's tests to properly reflect the missing state for its
queries so the client library would have properly failed before, and now
properly succeeds.

BUG=chromium:687625
TEST=unit
R=hinoka@chromium.org

Review-Url: https://codereview.chromium.org/2697223002
Committed: https://github.com/luci/luci-go/commit/ddca4ffe013b628ca436a6c7a3df7d565ba2e8b0

[hinoka, 2017-02-16 02:10:55]

lgtm

[dnj, 2017-02-16 02:11:19]

The CQ bit was checked by dnj@chromium.org

[dnj, 2017-02-16 02:11:27]

The CQ bit was checked by dnj@chromium.org

[commit-bot: I haz the power, 2017-02-16 02:11:31]

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, 2017-02-16 02:19:45]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1487211079458830, "parent_rev":
"d877e6ad0b14c097953d118872e07d2d90b3ba12", "commit_rev":
"ddca4ffe013b628ca436a6c7a3df7d565ba2e8b0"}

[commit-bot: I haz the power, 2017-02-16 02:19:49]

Description was changed from

==========
Fix LogDog client queries without state.

LogDog is allowed to issue queries without retrieving state. However,
the client library considered a lack of state an error. Update it to
permit this.

Update Milo's tests to properly reflect the missing state for its
queries so the client library would have properly failed before, and now
properly succeeds.

BUG=chromium:687625
TEST=unit
R=hinoka@chromium.org
==========

to

==========
Fix LogDog client queries without state.

LogDog is allowed to issue queries without retrieving state. However,
the client library considered a lack of state an error. Update it to
permit this.

Update Milo's tests to properly reflect the missing state for its
queries so the client library would have properly failed before, and now
properly succeeds.

BUG=chromium:687625
TEST=unit
R=hinoka@chromium.org

Review-Url: https://codereview.chromium.org/2697223002
Committed:
https://github.com/luci/luci-go/commit/ddca4ffe013b628ca436a6c7a3df7d565ba2e8b0
==========

[commit-bot: I haz the power, 2017-02-16 02:19:50]

Committed patchset #1 (id:1) as
https://github.com/luci/luci-go/commit/ddca4ffe013b628ca436a6c7a3df7d565ba2e8b0