[PCE] Impossible to select multiple storage backends in case at least one component contains any incompatibility option.

[Olesia Tsvigun]

 Impossible to select multiple storage backends in case at least one component contains any incompatibility section.

Steps to reproduce
1. Create plugin with components:
-name: 'storage:image:swift'
  label: 'swift'
  description: 'swift'
  incompatible:
    - name: 'storage:image:ceph'
  compatible:
    - name: 'storage:image:cat'
- name: 'storage:image:cat'
  label: 'cat'
  description: 'cat'
2. Try to create env with swift and cat storages.

Actual result
 All storage image components are displayed as radio buttons instead of checkboxes. So it's impossible to select multiple storages swift and cat. But in case ' incompatible' section is absent, all storage image components are displayed as checkboxes and it's possible to select these components.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/258972

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/258972
Committed: https://git.openstack.org/cgit/openstack/fuel-web/commit/?id=f337a81945de42e5792967cb2663f01bf487c4c5
Submitter: Jenkins
Branch: master

commit f337a81945de42e5792967cb2663f01bf487c4c5
Author: Anton Zemlyanov <email address hidden>
Date: Thu Dec 17 15:11:32 2015 +0300

    Fix the multiple storage backends incompatibility testing

    Fixes the areComponentsMutuallyExclusive method to work properly

    Change-Id: I11ea9608fdb02e2f1d3c4523f18733f7b7d5c50d
    Closes-Bug: 1526969

[Olesia Tsvigun (otsvigun)]

Verified at Fuel ISO#328
OS Ubuntu