Add support for PKCS8 certificate for /etc/rancher/ssl/key.pem
Add support for PKCS8 certificate for /etc/rancher/ssl/key.pem

cjellick/rancher,rancherio/rancher,rancherio/rancher,rancher/rancher,cjellick/rancher,cjellick/rancher,rancher/rancher,rancher/rancher,rancher/rancher