Change run_test_cases to always put in xml the first try instead of the last try
Change run_test_cases to always put in xml the first try instead of the last try

This will fill the flakiness dashboard with all the flaky tests, even if the
overall testing passed with retries. This had received approbation on
chromium-dev a few weeks ago but I had forgot to implement it.

R=csharp@chromium.org
BUG=


Review URL: https://chromiumcodereview.appspot.com/12594032

git-svn-id: d5a9b8648c52d490875de6588c8ee7ca688f9ed1@190972 0039d316-1c4b-4281-b951-d872f2087c98

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