Recommended update for crowbar-barclamp-nova_dashboard

This update for crowbar-barclamp-nova_dashboard provides stability fixes from the upstream OpenStack project: * Use a host specific memcache key for django_compressor (bnc#894070) * Add Requires on crowbar-barclamp-openstack for the new crowbar-openstack cookbook. * Use helpers from new crowbar-openstack cookbook * Fix apache with HA not running until second chef-client run * Configure horizon before configuring the vhost for horizon in apache * Avoid races with HA on 'python manage.py syncdb' * Add dependency on crowbar-barclamp-openstack as Requires(post) and Requires to make sure the package is installed before the %post scriplet is executed (bnc#900887).