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xenapi is going to support pool-based multi-hosts OpenStack environments, aggregate-based-pools support was removed in change I2c492c46e85c1df96aa7fdc12cdee0b1c7ba775e. This patch is used to update related OpenStack documents. Change-Id: I9a1244fb23aea99eb246325d5655ab005dca42b4 Implements: blueprint live-migration-in-xapi-pool