use RHEL 6 image instead of defunkt 6.6
use RHEL 6 image instead of defunkt 6.6

chrishultin/drupal-multi,JasonBoyles/drupal-parallel-test,pratikmallya/drupal-multi,pratikmallya/drupal-multi,pratikmallya/drupal-multi,pratikmallya/drupal-multi,rackspace-orchestration-templates/drupal-multi,brint/drupal-multi,rackspace-orchestration-templates/drupal-multi,chrishultin/drupal-multi,pratikmallya/drupal-multi,rackspace-orchestration-templates/drupal-multi,chrishultin/drupal-multi,JasonBoyles/drupal-parallel-test,brint/drupal-multi,rackspace-orchestration-templates/drupal-multi,JasonBoyles/drupal-parallel-test,brint/drupal-multi,brint/drupal-multi,JasonBoyles/drupal-parallel-test,chrishultin/drupal-multi,brint/drupal-multi,chrishultin/drupal-multi,rackspace-orchestration-templates/drupal-multi