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4ad9ac5e71
Changes: To make sure migration does not attempt to pick a host that has running VMs more than the max guest VM's limit: - Changed manual migration to call host allocators to return a list of hosts suitable for migration. Host allocators check for the max guest VM limit. - Earlier we returned hosts with enough capacity but now Host Allocators make other checks along with capacity. So the list of hosts returned are hosts that have enough capacity AND satisfy all other conditions like host tags, max guests limit etc. Or in other words Allocators dont return the hosts that dont satisfy all conditions even if they have capacity. -Therefore, now we mark the list of hosts returned for manual migration as 'suitable' hosts instead of 'hasenoughCapacity' in the HostResponse. - HA migration already calls allocators, so no change is needed there.