Add availability to ensure nodes moved from enroll to available

Starting from Ironic API microversion 1.11 newly-created nodes
added in enroll state. To move all nodes from enroll state to
available the following pillar might be used:

  ironic:
    client:
      node_state_transition:
        enabled: true
        enroll_to_available:
          provision_state: 'enroll'

Change-Id: If2249ba17eb3c4b89079a78fbd14b129ef80ed01
3 files changed