Rethrow Isolate gRPC proxy exceptions as IOError

Rethrow Isolate gRPC proxy exceptions as IOError

BUG=

Review-Url: https://codereview.chromium.org/2599493002
Committed: https://github.com/luci/luci-py/commit/71a0a2d56a38116fe36a07c8a03851c0b2a51e3e

[aludwin, 2016-12-21 17:26:16]

aludwin@google.com changed reviewers:
+ maruel@chromium.org, ryanmartens@google.com

[aludwin, 2016-12-21 17:26:16]

Ensures that all gRPC errors are converted to IOError. My understanding is that
this will allow isolatedserver.py to retry them, though my unit tests aren't
sophisticated enough to test this and I haven't observed it actually happening
yet.

[M-A Ruel, 2016-12-21 17:30:05]

lgtm

[aludwin, 2016-12-21 18:02:07]

The CQ bit was checked by aludwin@google.com

[commit-bot: I haz the power, 2016-12-21 18:02:09]

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

[aludwin, 2016-12-21 18:26:55]

The CQ bit was unchecked by aludwin@google.com

[aludwin, 2016-12-21 18:27:09]

The CQ bit was checked by aludwin@google.com

[commit-bot: I haz the power, 2016-12-21 18:27:19]

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, 2016-12-21 18:36:04]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1482344829808530, "parent_rev":
"0f3cdde6c7b7b9118ac93a549b18fdc7b96b716b", "commit_rev":
"71a0a2d56a38116fe36a07c8a03851c0b2a51e3e"}

[commit-bot: I haz the power, 2016-12-21 18:36:09]

Description was changed from

==========
Rethrow Isolate gRPC proxy exceptions as IOError

BUG=
==========

to

==========
Rethrow Isolate gRPC proxy exceptions as IOError

BUG=

Review-Url: https://codereview.chromium.org/2599493002
Committed:
https://github.com/luci/luci-py/commit/71a0a2d56a38116fe36a07c8a03851c0b2a51e3e
==========

[commit-bot: I haz the power, 2016-12-21 18:36:10]

Committed patchset #1 (id:1) as
https://github.com/luci/luci-py/commit/71a0a2d56a38116fe36a07c8a03851c0b2a51e3e