Handle URLError timeout from Rietveld

While communicating to Rietveld, urllib2 request timed out and raised URLError, which was not handled in try_job_on_rietveld._update_jobs_from_rietveld() and propagated to the top CQ loop causing a crash. This patch fixes it.

BUG=337907

Review URL: https://codereview.chromium.org/144343006

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/commit-queue@247376 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed