Can not create more than 10 networks even after applied Quota in RHOS 3.0

Issue

• To control quotas in quantum, updated the configuratgion and set the limits. But, it's still uses the default values for quotas

1. updated quota_drvier in /etc/quantum/quantum.conf

 quota_driver = quantum.db.quota_db.DbQuotaDriver

2. Restarte quantum-server services on networking node

$ service quantum-server restart

3. ran commands:

$ quantum quota-update --tenant_id <ID> --network 20
$ quantum quota-update --tenant_id <ID> --subnet 20

4. created networks with the below command

 quantum net-create --tenant_id <ID> <network name> 

But, it's failed after 10 networks with the below error message

   Quota exceeded for resources: ['network']