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Add tests to verify CID collision rules across different vsock namespace modes. 1. Two VMs with the same CID cannot start in different global namespaces (ns_global_same_cid_fails) 2. Two VMs with the same CID can start in different local namespaces (ns_local_same_cid_ok) 3. VMs with the same CID can coexist when one is in a global namespace and another is in a local namespace (ns_global_local_same_cid_ok and ns_local_global_same_cid_ok) The tests ns_global_local_same_cid_ok and ns_local_global_same_cid_ok make sure that ordering does not matter. The tests use a shared helper function namespaces_can_boot_same_cid() that attempts to start two VMs with identical CIDs in the specified namespaces and verifies whether VM initialization failed or succeeded. Reviewed-by: Stefano Garzarella <sgarzare@redhat.com> Signed-off-by: Bobby Eshleman <bobbyeshleman@meta.com> Link: https://patch.msgid.link/20260121-vsock-vmtest-v16-10-2859a7512097@meta.com Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com>