Make fix_test_cases.py shuffle the test list to run to improve success rate.
Make fix_test_cases.py shuffle the test list to run to improve success rate.

Systematically move the failing test cases at the end of the queue to improve
the chance of getting through all test cases in case of broken test cases,
independent of test isolation.

Improve message output.

R=csharp@chromium.org
BUG=


Review URL: https://chromiumcodereview.appspot.com/11362015

git-svn-id: d5a9b8648c52d490875de6588c8ee7ca688f9ed1@165203 0039d316-1c4b-4281-b951-d872f2087c98

luci/luci-py,luci/luci-py,luci/luci-py,luci/luci-py