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BaremetalProvisionStates.NOSTATE (``None``) was replaced by AVAILABLE ("available") in Ironic version 1.2. ENROLL ("enroll") state was introduced in version 1.12. This patch also updates the BaremetalScenarioTest.terminate_instance method to wait for etiher NOSTATE or AVAILABLE. Change-Id: I067504e49f68929298c91e61819aa9a61169fe52