Update magento-single.yaml
Update magento-single.yaml

Tested on CentOS 6.5 (PVHVM). All appears well
chrishultin/magento-single,pratikmallya/magento-single,rackspace-orchestration-templates/magento-single,chrishultin/magento-single,chrishultin/magento-single,pratikmallya/magento-single,rackspace-orchestration-templates/magento-single,pratikmallya/magento-single,pratikmallya/magento-single,rackspace-orchestration-templates/magento-single,chrishultin/magento-single,rackspace-orchestration-templates/magento-single,rackspace-orchestration-templates/magento-single,pratikmallya/magento-single,chrishultin/magento-single