hyperv: error if not admin

creating vsocks in windows requires admin privileges.  there could be
some workarounds made in the future,but the general deal has
always been, you need to be admin.  lets enforce this with an error
until those work-arounds can be implemented.

Signed-off-by: Brent Baude <bbaude@redhat.com>

pkg/machine/provider/platform_windows.go

@@ -32,6 +32,9 @@ func Get() (vmconfigs.VMProvider, error) {
 	case define.WSLVirt:
 		return new(wsl.WSLStubber), nil
 	case define.HyperVVirt:
+		if !wsl.HasAdminRights() {
+			return nil, fmt.Errorf("hyperv machines require admin authority")
+		}
 		return new(hyperv.HyperVStubber), nil
 	default:
 		return nil, fmt.Errorf("unsupported virtualization provider: `%s`", resolvedVMType.String())