Fix GS client breakage, remove offset hacks.

Fix GS client breakage, remove offset hacks.

A recent update to the Google Cloud Storage client library caused the
existing hacks to add range support to break, resulting in an inability
to read archived logs. Fortunately, the client library also added
support for a range reader!

This CL removes the offset hacks and switches over to the first-class
range reader.

BUG=chromium:597886
Committed: https://github.com/luci/luci-go/commit/fdfa04c6c456d06e5aad68069c79b05a6b4e71dd

[iannucci, 2016-03-31 17:56:50]

iannucci@chromium.org changed reviewers:
+ iannucci@chromium.org

[iannucci, 2016-03-31 17:56:50]

Yay less hacks! lgtm

[dnj, 2016-04-01 22:25:08]

The CQ bit was checked by dnj@chromium.org

[commit-bot: I haz the power, 2016-04-01 22:25:17]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1844253002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1844253002/1

[dnj, 2016-04-01 22:25:21]

The CQ bit was unchecked by dnj@chromium.org

[dnj, 2016-04-01 22:25:46]

Description was changed from

==========
Fix GS client breakage, remove offset hacks.

A recent update to the Google Cloud Storage client library caused the
existing hacks to add range support to break, resulting in an inability
to read archived logs. Fortunately, the client library also added
support for a range reader!

This CL removes the offset hacks and switches over to the first-class
range reader.

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

to

==========
Fix GS client breakage, remove offset hacks.

A recent update to the Google Cloud Storage client library caused the
existing hacks to add range support to break, resulting in an inability
to read archived logs. Fortunately, the client library also added
support for a range reader!

This CL removes the offset hacks and switches over to the first-class
range reader.

BUG=chromium:597886
==========

[dnj, 2016-04-01 22:25:50]

The CQ bit was checked by dnj@chromium.org

[commit-bot: I haz the power, 2016-04-01 22:25:56]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1844253002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1844253002/1

[commit-bot: I haz the power, 2016-04-01 22:35:46]

Description was changed from

==========
Fix GS client breakage, remove offset hacks.

A recent update to the Google Cloud Storage client library caused the
existing hacks to add range support to break, resulting in an inability
to read archived logs. Fortunately, the client library also added
support for a range reader!

This CL removes the offset hacks and switches over to the first-class
range reader.

BUG=chromium:597886
==========

to

==========
Fix GS client breakage, remove offset hacks.

A recent update to the Google Cloud Storage client library caused the
existing hacks to add range support to break, resulting in an inability
to read archived logs. Fortunately, the client library also added
support for a range reader!

This CL removes the offset hacks and switches over to the first-class
range reader.

BUG=chromium:597886

Committed:
https://github.com/luci/luci-go/commit/fdfa04c6c456d06e5aad68069c79b05a6b4e71dd
==========

[commit-bot: I haz the power, 2016-04-01 22:35:47]

Committed patchset #1 (id:1) as
https://github.com/luci/luci-go/commit/fdfa04c6c456d06e5aad68069c79b05a6b4e71dd