[9.x][Tempest] Cannot change compute quotas

[Vladimir Jigulin]

Tempest tests failed:
test_update_default_quotas
test_get_updated_quotas
test_create_server_when_instances_quota_is_full
test_create_server_when_cpu_quota_is_full
test_create_server_when_memory_quota_is_full

Steps to reproduce:
root@node-1:~# openstack quota show admin|grep instances
| instances | -1 |
root@node-1:~# openstack quota set admin --instances 5
root@node-1:~#
root@node-1:~# openstack quota show admin|grep instances
| instances | -1 |

Expected results: quota been changed
Actual result: cannot change quota

openstack quota set admin --instances 25 --debug: http://termbin.com/39nf

Reproducibility: 100%

Description of the environment:
ironic + dvr + sahara + ceilometer + cinder
ironic + dvr + sahara + ceilometer + cinder + ssl
ironic + dvr + sahara + ceilometer + nova
ironic + dvr + sahara + ceilometer + nova + ssl

Last pass: 04 april 2017
First fail: 10 june 2017

[Alexey Stupnikov (astupnikov)]

I have doublechecked fuel-qa code, fuel and Nova operations and got
the following conclusions:

1. It is possible to disable nova quotas in Fuel config. This option
   was introduced to limit the DB load. From technical perspective,
   this option enables noop Nova quota driver that returns -1
   (unlimited) values for all quota parameters without DB querries.
   At the same time, it is possible change quota values stred in DB,
   but they will not be used.
2. NOVA_QUOTAS_ENABLED option disables nova quotas.

This bug will be closed as Invalid, since reported issue is caused by
tempest configuration.

On the other hand, I have found other quota-related issues in MOS8
and MOS9. Opened a bug #1698805 to solve them.