Adds a new config option ``vsp_compute_target_ports`` to specify IDs of the storage ports used to attach volumes to compute nodes. Also adds a new config option ``vsp_horcm_pair_target_ports`` to specify IDs of the storage ports used to copy functions by Hitachi storage. DocImpact Change-Id: I5b0a8ff08b1faddf38567d8b038a4847d00f2fa7
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