<feature>[vm]: support DELETE /vm-instances/metadata bulk cleanup#3882

MatheMatrix wants to merge 1 commit intozsv_5.0.0MatheMatrix/zstack:zsv_5.0.0from

sync/tao.gan/add-APICleanupAllVmInstanceMetadataMsg-ZSV-11867@@3MatheMatrix/zstack:sync/tao.gan/add-APICleanupAllVmInstanceMetadataMsg-ZSV-11867@@3Copy head branch name to clipboard