Can not change Datastore regex for compute-vmware after failed or stopped deploy

[Ekaterina Khomyakova]

Fuel 9.1
DVS #876

Steps to reproduce:
1. Create env with roles:
- Controller
- Cinder-VMware
- Compute-VMware
Enable Glance backend
2. Add Nova Compute Instances on controllers and compute-vmware
3. Set Datastore regex for compute-vmware to incorrect value (e.g. !@#$%^&*()), set incorrect Glance Datacenter regex
4. Deploy cluster (it should fail)
5. Try to change Datastore regex for compute-vmware (e.g. type '.*' and press 'Save Changes')

Expected results:
New value will be changed

Actual result:
UI doesn't save changes
Nailgun returns Bad Request (HTTP 400)

Additional info:
The same behavior is after stopping the deploy after ~50% of progress

[Ilya Bumarskov (ibumarskov)]

Moved to 9.2

[Ekaterina Khomyakova (ekhomyakova)]

I tried to change regex via CLI, but it still doesn't work:
400 Client Error: Bad Request for url: http://10.109.0.2:8000/api/v1/clusters/1/vmware_attributes (Parameter 'datastore_regex' of nova compute instance with target node 'Untitled (48:73)' couldn't be changed)

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

Related fix proposed to branch: master
Change author: Olena Logvinova <email address hidden>
Review: https://review.fuel-infra.org/29764

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

Reviewed: https://review.fuel-infra.org/29764
Submitter: Mariia Zlatkova <email address hidden>
Branch: master

Commit: 43e971fa2cccbe9c2584365c4a719b49f414edc6
Author: Olena Logvinova <email address hidden>
Date: Wed Jan 11 11:07:51 2017

[RN9.2] Fuel known issue description

Change-Id: Iff2cd947a1a40b41c2102465de26f11725daba8d
Related-Bug: #1616457