Roll src/tools/swarming_client/ f71d1a3fb..6e5d2b21f (2 commits) and tools/luci-go.

Roll src/tools/swarming_client/ f71d1a3fb..6e5d2b21f (2 commits) and tools/luci-go.

https://chromium.googlesource.com/external/swarming.client.git/+log/f71d1a3fbe20..6e5d2b21f0ac

$ git log f71d1a3fb..6e5d2b21f --date=short --format='%ad %ae %s'
2015-09-23 maruel Transparently retry 404s when served from CloudEndpoints and not as json.
2015-09-21 maruel Recreate the work dir in run_isolated.py.

--

Also update luci-go to 655db76c52c65876f8e803451525b950a7c83f8a to include a
similar fix w.r.t. Endpoints.

R=vadimsh@chromium.org
BUG=522388
Committed: https://crrev.com/a790dceb79394687cf75d3ab25bc3a2a73d15a19
Cr-Commit-Position: refs/heads/master@{#350569}

[M-A Ruel, 2015-09-24 13:35:54]

cc'ing people affected by this bug in Endpoints. Sadly I couldn't test for its
effectiveness so once it's rolled in, please ping me if you see any 404 related
failures.

[Vadim Sh., 2015-09-24 16:20:53]

lgtm

[M-A Ruel, 2015-09-24 16:25:44]

The CQ bit was checked by maruel@chromium.org

[commit-bot: I haz the power, 2015-09-24 16:26:06]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1369513003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1369513003/1

[commit-bot: I haz the power, 2015-09-24 16:36:21]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-24 16:37:13]

Patchset 1 (id:??) landed as
https://crrev.com/a790dceb79394687cf75d3ab25bc3a2a73d15a19
Cr-Commit-Position: refs/heads/master@{#350569}