cleanup for the specialaccounts nodemanager plugin: * root receives keys for all admins regardless of their site * remove conf_files for root's and site_admin's authorized keys * root_ssh_key does not get generated in /etc/planetlab anymore * cleaned up ROOT_SSH_KEY_PUB and ROOT_SSH_KEY from xml config as well
cleanup for the specialaccounts nodemanager plugin:
* root receives keys for all admins regardless of their site
* remove conf_files for root's and site_admin's authorized keys
* root_ssh_key does not get generated in /etc/planetlab anymore
* cleaned up ROOT_SSH_KEY_PUB and ROOT_SSH_KEY from xml config as well


dreibh/planetlab-lxc-plcapi,dreibh/planetlab-lxc-plcapi,dreibh/planetlab-lxc-plcapi,dreibh/planetlab-lxc-plcapi