no failure message when network yaml contains errors

[Andrew Woodward]

If you have parsing, or other logical errors in network yaml during upload they are ignored and a partial update with no failure feedback is performed

steps to repoduce

1. create env
2. download network yaml
3. alter network yaml by [a][b]
4. upload network yaml
5. copy file with changes elsewhere
6. download network yaml
7. compare (diff) proposed and current yaml.

[a] alter the network ip_range for storage, management
[b] change the cidr to 192.168.2900.0/24

expected result:

the fuel api returns an error and message that indicates that the update failed

[Andrew Woodward (xarses)]

+customer-found and +feature-nodgroup as it's most likely to be seen then

[Maciej Kwiek (maciej-iai)]

`raise_task` method does not raise an actual exception, thus returning 200 status, which causes the cli to assume that everything went fine.

I could not reproduce the "partial" update with the error, can you provide me with example yamls that lead to this behavior?

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/207821

[Maciej Kwiek (maciej-iai)]

It seems that my patch should also fix https://bugs.launchpad.net/fuel/+bug/1423916, change the way UI handles these handlers. It's too much work, I won't be able to merge this before SCF. I will ask to move this bug to 8.0.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/210034

[Andrew Woodward (xarses)]

Bump priority because of additional report and customer found status

https://bugs.launchpad.net/fuel/+bug/1483255

[Przemyslaw Kaminski (pkaminski)]

Relevant discussion why 400 status in network check was removed:
https://review.openstack.org/#/c/137642/15/nailgun/nailgun/api/v1/handlers/network_configuration.py
If you change it back, you will create UI errors: https://review.openstack.org/#/c/161246/
A fix for CLI: https://bugs.launchpad.net/fuel/+bug/1483211
Tasks should be removed from network configuration: https://bugs.launchpad.net/fuel/+bug/1423916

[OpenStack Infra (hudson-openstack)]

Change abandoned by Alexander Kuleshov (<email address hidden>) on branch: master
Review: https://review.openstack.org/210034
Reason: Addressed by https://review.openstack.org/#/c/211126/

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/6.1
Review: https://review.openstack.org/213045

[OpenStack Infra (hudson-openstack)]

Change abandoned by Alexander Kuleshov (<email address hidden>) on branch: stable/6.1
Review: https://review.openstack.org/209452
Reason: Addressed by https://review.openstack.org/#/c/213045/

[Ihor Kalnytskyi (ikalnytskyi)]

Move it to 6.1 because it's already fixed in 7.1.

[OpenStack Infra (hudson-openstack)]

Change abandoned by Maciej Kwiek (<email address hidden>) on branch: master
Review: https://review.openstack.org/207821

[OpenStack Infra (hudson-openstack)]

Change abandoned by Tony Breeds (<email address hidden>) on branch: stable/6.1
Review: https://review.openstack.org/213045
Reason: This branch (stable/6.1) is at End Of Life