Add APIv2 support to make host optional on evacuate.
Change-Id: I68121debecb944af82c5c0c52debc5dc11640204 Closes-Bug: #1357212
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xml:id="nova_cli_evacuate">
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<title>Evacuate instances</title>
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<para>If a cloud compute node fails due to a hardware malfunction or another reason, you can
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evacuate instances to make them available again. You can choose evacuation parameters for
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your use case.</para>
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evacuate instances to make them available again. You can optionally include the target host
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on the <command>evacuate</command> command. If you omit the host, the scheduler determines
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the target host.</para>
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<para>To preserve user data on server disk, you must configure shared storage on the target
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host. Also, you must validate that the current VM host is down; otherwise, the evacuation
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fails with an error.</para>
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