Fraction RX_TX value not getting applied to Neutron Queue QOS

I noticed this in Icehouse using Neutron backed by NSX.

Not sure if it is related to a similar issue that was fixed : https://review.openstack.org/#/c/188560/1

Following are steps to reproduce it :

1. Create flavor with RX_TX as 0.25 and 1.5

2. Create a neutron qos queue with max bandwidth value of 1024

3. Create a network with queue_id attached

4. Spin a VM with flavor having RX_TX value of 0.25

5. Execute neturon queue-list.

+--------------------------------------+--------------+-----+------+-------------+------+---------+
| id | name | min | max | qos_marking | dscp | default |
+--------------------------------------+--------------+-----+------+-------------+------+---------+
| 1b67eeb5-8568-43da-a7de-4bf4248b874d | qostestqueue | 0 | 1024 | untrusted | 0 | False |
| efe223ab-c8aa-46bc-bc62-504dba6f7960 | qostestqueue | 0 | 1024 | untrusted | 0 | False |
+--------------------------------------+--------------+-----+------+-------------+------+---------+

Expected max value was 256 instead we see 1024. Similar issue is seen creating flavor with RX_TX of 1.5

It works for non fractional RX_TX values e.x. for RX_TX we do see a neutron queue with max value of 5120