Roll src/tools/swarming_client/ 8fce79620..05e17879a (6 commits).

Roll src/tools/swarming_client/ 8fce79620..05e17879a (6 commits).

https://chromium.googlesource.com/external/swarming.client.git/+log/8fce79620b04..05e17879accc

$ git log 8fce79620..05e17879a --date=short --no-merges --format='%ad %ae %s'
2015-11-18 maruel Improve tools/count.py to add sum per year and total.
2015-11-18 maruel Add Endpoints API to count tasks.
2015-11-17 maruel Fix typo in previous commit.
2015-11-16 maruel Report an error when triggering fails.
2015-11-11 maruel Add support to unset an environment variable.
2015-10-23 maruel Add support for extra arguments to swarming.py reproduce.

R=vadimsh@chromium.org
BUG=

Committed: https://crrev.com/5b7ded79037ee6aff5f346e66388a6eef6b80c79
Cr-Commit-Position: refs/heads/master@{#360520}

[Vadim Sh., 2015-11-19 02:29:16]

lgtm

[M-A Ruel, 2015-11-19 02:36:01]

The CQ bit was checked by maruel@chromium.org

[commit-bot: I haz the power, 2015-11-19 02:36:22]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1456293002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1456293002/1

[commit-bot: I haz the power, 2015-11-19 04:07:53]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-19 04:08:42]

Patchset 1 (id:??) landed as
https://crrev.com/5b7ded79037ee6aff5f346e66388a6eef6b80c79
Cr-Commit-Position: refs/heads/master@{#360520}