Comment 4 for bug 1508973

Reviewed: https://review.openstack.org/259904
Committed: https://git.openstack.org/cgit/openstack/fuel-web/commit/?id=64c0711e1595bf8fe783b250e5ba154c70652494
Submitter: Jenkins
Branch: master

commit 64c0711e1595bf8fe783b250e5ba154c70652494
Author: Artem Roma <email address hidden>
Date: Mon Dec 21 10:26:38 2015 +0200

    Add distinguisher field for default node group

    What was done:
    * new field to node group orm model class added - boolean flag 'default';
    * alembic migration for 8.0 version updated respectively;
    * code that operates on default node group changed in regard of new
      attribute;
    * checking logic of CheckBeforeDeploymentTask._validate_network_template
      refactored;
    * related tests updated.

    Change-Id: If751ea8d11fe7d7d01616e695998f3c276a12b5c
    Closes-Bug: #1508973