removes requirement that /etc/planetlab/plc_config should exist, for use on non-myplc boxes
removes requirement that /etc/planetlab/plc_config should exist, for use on non-myplc boxes


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