Fix the unit test error
Fix the unit test error

1. What is the problem?

   the unit test can not pass.

2. What is the solution to the problem?

   add the segmentation_id to the subnet.

3. What the features to be implemented in the Tricircle to realize the solution?

   no

Signed-off-by: song baisen <songbaisen@szzt.com.cn>

Change-Id: I023a46af393b94cc3c4f2ec9f5636e740fa12224
Co-Authored-By: tangzhuo <a1269c0df3bffcdec7b2711cfcc3364aa631ef3d@hnu.edu.cn>, zhiyuan_cai <luckyvega.g@gmail.com>

openstack/tricircle,stackforge/tricircle,stackforge/tricircle,openstack/tricircle