Python 2.6=< for setup.py, remove old build

setup.py not exits if python is older than 2.6
Removed rhel5 build from release engineering
Python 2.6 version_info is a tuple
Replace --non-interactive with -n

Older versions of sudo did not support the long option --non-interactive
but only -n.
Update mock tests for pynag.Control.daemon
Merge pull request #159 from pynag/bugfix-sudo-bad-option

Replace --non-interactive with -n
Merge pull request #157 from pynag/python26-or-newer

Python 2.6=< for setup.py, remove old build
Typo
Merge pull request #161 from zanglang/patch-1

Typo