ironic.conf loses enabled_drivers after node deletion

[Stanislav Makar]

Cluster configuration:
3 nodes - controller, ceph osd, ironic
2 node - compute

Fuel version
495
mitaka-9.0
9.0

How to reproduce:
- deploy cluster and inspect /etc/ironic/ironic.conf
grep enabled_drivers /etc/ironic/ironic.conf
enabled_drivers = fuel_ssh,fuel_ipmitool,fake,fuel_libvirt

- remove one computer node, deploy changes and inspect /etc/ironic/ironic.conf
grep enabled_drivers /etc/ironic/ironic.conf
enabled_drivers = pxe_ipmitool

Logs from one node (controller, ceph osd, ironic):

grep enabled_drivers -r /var/log/
/var/log/puppet.log:2017-03-23 18:24:30 +0000 /Stage[main]/Ironic/Ironic_config[DEFAULT/enabled_drivers]/value (notice): value changed 'pxe_ipmitool' to 'fuel_ssh,fuel_ipmitool,fake,fuel_libvirt'
/var/log/puppet.log:2017-03-24 06:29:50 +0000 /Stage[main]/Ironic/Ironic_config[DEFAULT/enabled_drivers]/value (notice): value changed 'fuel_ssh,fuel_ipmitool,fake,fuel_libvirt' to 'pxe_ipmitool'

[Oleksiy Molchanov (omolchanov)]

Stas, you know the procedure, please attach diagnostic snapshot.

[Stanislav Makar (smakar)]

Oleksiy, no problem
https://drive.google.com/open?id=0B2zj1zD0B771c3ZHa2gtVEgyX0E

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/mitaka
Review: https://review.openstack.org/454092

[Fuel Devops McRobotson (fuel-devops-robot)]

Fix proposed to branch: 9.0/mitaka
Change author: Oleksiy Molchanov <email address hidden>
Review: https://review.fuel-infra.org/37293

[Fuel Devops McRobotson (fuel-devops-robot)]

Reviewed: https://review.fuel-infra.org/37293
Submitter: Pkgs Jenkins <email address hidden>
Branch: 9.0/mitaka

Commit: f8fd1394054c305d3e934563ad587606e7111066
Author: Oleksiy Molchanov <email address hidden>
Date: Thu Nov 23 20:20:12 2017

Add enabled_drivers to ironic declaration

Change-Id: Id579a9909ce55deb93be4f344aa7c09291f52afe
Closes-Bug: 1675647

[Vladimir Jigulin (vjigulin)]

Verified on 9.2-mu5-proposed

[OpenStack Infra (hudson-openstack)]

Change abandoned by Andreas Jaeger (<email address hidden>) on branch: stable/mitaka
Review: https://review.opendev.org/454092
Reason: This repo is retired now, no further work will get merged.