use pvhvm image for CentOS 6
use pvhvm image for CentOS 6

rackspace-orchestration-templates/magento-single,rackspace-orchestration-templates/magento-single,rackspace-orchestration-templates/magento-single,pratikmallya/magento-single,pratikmallya/magento-single,chrishultin/magento-single,rackspace-orchestration-templates/magento-single,pratikmallya/magento-single,chrishultin/magento-single,pratikmallya/magento-single,rackspace-orchestration-templates/magento-single,pratikmallya/magento-single,chrishultin/magento-single,chrishultin/magento-single,chrishultin/magento-single