remove gateway check

Signed-off-by: bingshen.wbs <bingshen.wbs@alibaba-inc.com>

plugins/ipam/host-local/backend/allocator/range.go

@@ -53,10 +53,6 @@ func (r *Range) Canonicalize() error {
 		if err := canonicalizeIP(&r.Gateway); err != nil {
 			return err
 		}
-		subnet := (net.IPNet)(r.Subnet)
-		if !subnet.Contains(r.Gateway) {
-			return fmt.Errorf("gateway %s not in network %s", r.Gateway.String(), subnet.String())
-		}
 	}
 
 	// RangeStart: If specified, make sure it's sane (inside the subnet),