support/testing: switch go-src to use flannel

The test currently uses tinifier, but it can't be vendored as of today,
so switch to use flannel which can (still?) be...

Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

support/testing/tests/package/test_go.py

@@ -19,9 +19,9 @@ class TestGoSource(TestGoBase):
         BR2_TARGET_ROOTFS_CPIO=y
         BR2_PACKAGE_HOST_GO=y
         BR2_PACKAGE_HOST_GO_SRC=y
-        BR2_PACKAGE_TINIFIER=y
+        BR2_PACKAGE_FLANNEL=y
         """
 
     def test_run(self):
         self.login()
-        self.assertRunOk("tinifier -h")
+        self.assertRunOk("/opt/bin/flanneld -h")