Roll src/tools/swarming_client/ 9cdd76171..0b908f187 (11 commits).

https://chromium.googlesource.com/external/swarming.client.git/+log/9cdd76171e51..0b908f18767c

$ git log 9cdd76171..0b908f187 --date=short --no-merges --format='%ad %ae %s'
2016-01-20 maruel Do not crash on isolate.py batcharchive when .isolated.gen.json is missing.
2016-01-20 maruel Consider ProtocolError a transient error when reading.
2016-01-19 maruel Enable back TEMP directory override on Windows.
2016-01-12 maruel swarming.py bot: handle incorrect dimensions.
2016-01-11 maruel Update httplib2, oauth2client, pyasn1, python-rsa and requests; add six.
2016-01-06 maruel Fix swarming.py reproduce to include extra_args for isolated task.
2015-12-18 maruel In case of timeout, ignore internal failure.
2015-12-17 maruel Remove Symantec certificates that are no longer relevant.
2015-12-15 maruel Immediately write a json response file on start.
2015-12-15 maruel Remove stale reference to old /content-gs/ isolate API.
2015-12-07 maruel Add new endpoint tasks/requests to retrieve requests instead of results.

R=vadimsh@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1618893002

Cr-Commit-Position: refs/heads/master@{#370759}

DEPS

@@ -47,7 +47,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling swarming_client
   # and whatever else without interference from each other.
-  'swarming_revision': '9cdd76171e517a430a72dcd7d66ade67e109aa00',
+  'swarming_revision': '0b908f18767c8304dc089454bc1c91755d21f1f5',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling ANGLE
   # and whatever else without interference from each other.