Use single quotes with node attributes refs, addresses offences from https://travis-ci.org/xhost-cookbooks/openvpn/jobs/16129746.
Use single quotes with node attributes refs, addresses offences from https://travis-ci.org/xhost-cookbooks/openvpn/jobs/16129746.

zackp30/openvpn,chrisduong/openvpn,chrisduong/openvpn,xhost-cookbooks/openvpn,xhost-cookbooks/openvpn,cvisionlabops/openvpn,POSpulse/openvpn,xhost-cookbooks/openvpn,ForeverOceans/openvpn,flydata/openvpn,ai-traders/openvpn,cvisionlabops/openvpn,flydata/openvpn,zackp30/openvpn,zackp30/openvpn,ForeverOceans/openvpn,ai-traders/openvpn,ai-traders/openvpn,ForeverOceans/openvpn,cvisionlabops/openvpn,POSpulse/openvpn,POSpulse/openvpn,chrisduong/openvpn