Improve sharding supervisor to print out timed out shards.
Improve sharding supervisor to print out timed out shards.

It also makes sure to timeout faster than the buildbot time out, so the
remaining shards are printed out. Note that the timeout is hardcoded but can be
overriden.

BUG=
TEST=


Review URL: http://codereview.chromium.org/8919011

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@114430 0039d316-1c4b-4281-b951-d872f2087c98

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