nova service-list show inconsistent output for disabled_reason

[jichenjc]

[root@compute1 ~]# nova service-list
+----+------------------+----------+----------+---------+-------+----------------------------+-----------------+
| Id | Binary | Host | Zone | Status | State | Updated_at | Disabled Reason |
+----+------------------+----------+----------+---------+-------+----------------------------+-----------------+
| 4 | nova-scheduler | compute1 | internal | enabled | up | 2014-12-11T10:25:17.000000 | - |
| 5 | nova-compute | compute1 | nova | enabled | up | 2014-12-11T10:25:12.000000 | - |
| 6 | nova-consoleauth | compute1 | internal | enabled | down | 2014-12-10T07:39:27.000000 | - |
| 7 | nova-compute | compute2 | nova | enabled | down | 2014-12-10T07:39:25.000000 | None |
+----+------------------+----------+----------+---------+-------+----------------------------+-----------------+

the None at disabled_reason of id 7 is inconsistent to other columns
it should be - to avoid confusion

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/141005

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/141005
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=66cad4ce4df29bf528679ff8b65f055baa2c4af3
Submitter: Jenkins
Branch: master

commit 66cad4ce4df29bf528679ff8b65f055baa2c4af3
Author: jichenjc <email address hidden>
Date: Thu Dec 4 15:35:57 2014 +0800

    Make service-list output consistent

    When libvirt automatic disable/enable services, the disabled
    reason will be 'None'. However, the column is Nullable and
    make it 'None' let the service-list output inconsistent.
    This patch changes the default value to NULL.

    Change-Id: I958accb500b4b417d755cff8df8ef7d615b710c0
    Closes-Bug: #1401480