Undeterminate checkbox state is missed when changing screens

[Julia Aranovich]

Reproduced on 10.0 master in Fuel UI.

Steps to reproduce:

1. create environment, add a few controllers
2. check all the controllers on Nodes tab
3. uncheck one of the controllers => Select All checkbox of the controllers group has indeterminated state
4. go to Settings tab and return back to Nodes tab

Expected result: node selection is kept, Select All checkbox of the controllers group has indeterminated state

Actual result: node selection is kept Ok, but the Select All checkbox is in unchecked state

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/327574

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/327574
Committed: https://git.openstack.org/cgit/openstack/fuel-ui/commit/?id=7e533d86030f82c03539b70ade8c00d3f2aaa85e
Submitter: Jenkins
Branch: master

commit 7e533d86030f82c03539b70ade8c00d3f2aaa85e
Author: Julia Aranovich <email address hidden>
Date: Thu Jun 9 13:20:46 2016 +0300

    Fix Select All checkbox on Nodes tab

    Indeterminate state of Select All checkboxes should be calculated
    when switching cluster tabs.

    Closes-Bug: #1580953

    Change-Id: I3ae5a1cb557cbc2cb77c5f9a6f9a776efe59159c