Roll tools/swarming_client/ to bbf1fcca7932d92cca9d7dab46ea271a7f6d61fb.

Roll tools/swarming_client/ to bbf1fcca7932d92cca9d7dab46ea271a7f6d61fb.

$ git log 9755ed384..bbf1fcca7 --date=short --format='%ad %ae %s' | sed 's/@chromium\.org//'
2014-08-05 maruel Improve the load test script.
2014-08-04 maruel Fix a secondary exception when an error occurs to delete a directory.
2014-08-01 maruel Save client json data on the fly as the load test is on-going.

R=csharp@chromium.org
BUG=

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=287696

[csharp, 2014-08-05 19:10:22]

lgtm

[M-A Ruel, 2014-08-05 19:46:36]

The CQ bit was checked by maruel@chromium.org

[commit-bot: I haz the power, 2014-08-05 19:49:14]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/maruel@chromium.org/442063002/1

[commit-bot: I haz the power, 2014-08-06 00:11:08]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  mac_chromium_compile_dbg on tryserver.chromium.mac
(http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_comp...)

[commit-bot: I haz the power, 2014-08-06 06:07:09]

Change committed as 287696