Roll tools/swarming_client/ to 53ef013289e19388fe13e074de23188e489d0225.

Roll tools/swarming_client/ to 53ef013289e19388fe13e074de23188e489d0225.

$ git log b61a1802f..53ef01328 --date=short --format='%ad %ae %s' | sed 's/@chromium\.org//'
2015-03-20 phajdan.jr Add support for writing swarming.py query results to a file
2015-03-17 maruel Do not throw if the json file is missing or invalid.
2015-03-16 maruel Fix regression from 3c979cb54e which broke run_on_bots.py.
2015-03-13 maruel Handle race condition in terminate().
2015-03-13 maruel Change subprocess42 maxsize and timeouts arguments to be callable.
2015-03-11 maruel Switch most paths to be unicode and enforce it.
2015-03-10 cmassaro Switching from /content-gs/ to Endpoints API.

R=phajdan.jr@chromium.org
BUG=

Committed: https://crrev.com/2c90787990638e31794cf94c2cf13dcc50ad2327
Cr-Commit-Position: refs/heads/master@{#322206}

[M-A Ruel, 2015-03-20 17:51:16]

I think I had forgot to update the services thoroughly, doing.

[Paweł Hajdan Jr., 2015-03-23 13:32:32]

LGTM

[M-A Ruel, 2015-03-25 18:22:40]

The CQ bit was checked by maruel@chromium.org

[commit-bot: I haz the power, 2015-03-25 18:23:44]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1028693003/1

[commit-bot: I haz the power, 2015-03-25 19:17:29]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-25 19:19:07]

Patchset 1 (id:??) landed as
https://crrev.com/2c90787990638e31794cf94c2cf13dcc50ad2327
Cr-Commit-Position: refs/heads/master@{#322206}