Roll tools/swarming_client/ to f4e9ccbec29a745a8b7e6e913b7f7247036b0a09.

Roll tools/swarming_client/ to f4e9ccbec29a745a8b7e6e913b7f7247036b0a09.

$ git log 6b1084e27..f4e9ccbec --date=short --format='%ad %ae %s' | sed 's/@chromium\.org//'
2014-10-01 vadimsh Add --dump-json option to 'isolate.py batcharchive'.
2014-10-01 maruel Fix regression in 12a7da4e37; swarming.py collect collecting isolated output
2014-10-01 maruel Stop using get_matching_test_cases and get_results; use new client API.
2014-09-30 vadimsh Initial implementation of 'batcharchive' command.

R=vadimsh@chromium.org
BUG=

Committed: https://crrev.com/60e5101d0cccffaab3e659ae2b11531d0080cb8a
Cr-Commit-Position: refs/heads/master@{#297921}

[Vadim Sh., 2014-10-02 20:12:44]

lgtm

[M-A Ruel, 2014-10-02 20:16:59]

The CQ bit was checked by maruel@chromium.org

[M-A Ruel, 2014-10-02 20:17:19]

The CQ bit was checked by maruel@chromium.org

[commit-bot: I haz the power, 2014-10-02 20:18:58]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/623793002/1

[commit-bot: I haz the power, 2014-10-02 22:07:34]

Committed patchset #1 (id:1) as 3a7e4326d94bcc42a1bc61688211a7ffbda5e13a

[commit-bot: I haz the power, 2014-10-02 22:08:19]

Patchset 1 (id:??) landed as
https://crrev.com/60e5101d0cccffaab3e659ae2b11531d0080cb8a
Cr-Commit-Position: refs/heads/master@{#297921}