scheduler release hosts

-make scheduler really release hosts after verify failure.  We decided this is the desired behavior, and it fixes a bug with metahosts failing verify.
-make frontend only reset hosts to Ready if they are "dead" (status Dead or Repair Failed).  Otherwise hosts can get reset to ready while being repaired, and then two autoservs will run on the machine at once.

Signed-off-by: Steve Howard <showard@google.com>




git-svn-id: http://test.kernel.org/svn/autotest/trunk@1283 592f7852-d20e-0410-864c-8624ca9c26a4
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