fix loading gw_priority

Signed-off-by: Nicolas De Loof <nicolas.deloof@gmail.com>

Author: ndeloof

loader/loader_test.go

@@ -3706,3 +3706,16 @@ services:
 	assert.Equal(t, len(p.Services["test"].Gpus), 1)
 	assert.Equal(t, p.Services["test"].Gpus[0].Count, types.DeviceCount(-1))
 }
+
+func TestGwPriority(t *testing.T) {
+	p, err := loadYAML(`
+name: load-gw_priority
+services:
+  test:
+    networks:
+      test:
+        gw_priority: 42
+`)
+	assert.NilError(t, err)
+	assert.Equal(t, p.Services["test"].Networks["test"].GatewayPriority, 42)
+}