Comment 6 for bug 1556807

The Neutron dev community picked this bug and fixed it.

I tested the patch, and the result are much better now.
We do have very small degradation now.

Here are the results of the test with Dragonflow:
time spend to create 100 subnets: 167
time spend to create 100 subnets: 173
time spend to create 100 subnets: 181
time spend to create 100 subnets: 189
time spend to create 100 subnets: 197

Best regards,
Yuli