Make setup.py work with python 2.6
Make setup.py work with python 2.6

Python 2.6 doesn't have named components for sys.version_info.

einarnn/ncclient,sebastianw/ncclient,kroustou/ncclient,earies/ncclient,leopoul/ncclient,katharh/ncclient,GIC-de/ncclient,cmoberg/ncclient,vnitinv/ncclient,joysboy/ncclient,nnakamot/ncclient,nwautomator/ncclient,OpenClovis/ncclient,ncclient/ncclient,lightlu/ncclient,aitorhh/ncclient