Roll tools/swarming_client/ to 79940aeeec0ace78ade0fec27515850268761af5.

$ git log 926dccd2e..79940aeee --date=short --format='%ad %ae %s' | sed 's/@chromium\.org//'
2014-09-23 maruel Rename swarming.py query to bots and add a new query command.
2014-09-17 jam Fix isolate.py failing when run from src directory.

R=vadimsh@chromium.org
BUG=

Review URL: https://codereview.chromium.org/595183002

Cr-Commit-Position: refs/heads/master@{#296391}

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': '926dccd2ee01127e6c2c61a97e4d9c289e0383ee',
+  'swarming_revision': '79940aeeec0ace78ade0fec27515850268761af5',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling ANGLE
   # and whatever else without interference from each other.