Comment 0 for bug 1776160

1. openstack version: newton(same with master)
2. neutron --version 11.0.1
3. ovs-vsctl (Open vSwitch) 2.7.2
4. iperf3

The ovs config is as follow:
[root@cdpm04 common]# ovs-vsctl list qos
_uuid : b90a11e9-ea70-4908-8cb2-bab21e117312
external_ids : {id="qvocd3421e0-43"}
other_config : {max-rate="3000000"}
queues : {0=22ba7a96-328c-4876-b7ac-b35d77ce3a09}
type : linux-htb
[root@cdpm04 common]# ovs-vsctl list queue
_uuid : 22ba7a96-328c-4876-b7ac-b35d77ce3a09
dscp : []
external_ids : {id="qvocd3421e0-43", queue_type="0"}
other_config : {burst="300000", max-rate="3000000"}

The burst does not take effect.Even I change the value of burst, the result does not change.
The result is as follows:

[ ID] Interval Transfer Bandwidth Retr
[ 5] 0.00-11.27 sec 4.50 MBytes 3.35 Mbits/sec 0 sender
[ 5] 0.00-11.27 sec 3.87 MBytes 2.88 Mbits/sec receiver

I think this problem is related to [1][2].
Maybe we do not have to change like that.I revert the code and the result is accurate.

[1]https://bugs.launchpad.net/neutron/+bug/1730605
[2]https://review.openstack.org/519573