Fix: python 2.6 broken with 0.5.1
Fix: python 2.6 broken with 0.5.1

leopoul/ncclient,nnakamot/ncclient,einarnn/ncclient,vnitinv/ncclient,GIC-de/ncclient,nwautomator/ncclient,earies/ncclient,ncclient/ncclient