[2.2.12] waagent -configuration-path:/path -start not take effect

[yuhuijiang]

hi there,
I've ran the command "waagent -configuration-path:/path -start",but the parameter "-configuration-path" not take effect.
This will affect WALA running on RHEL6.x
(Because on RHEL6.x, execute WALA service through "serivce waagent start",it will invoke /etc/init.d/waaget.And in this file,execute WALA through "waagent -start",so this will affect WALA)

below is code in agent.py

220 def start():
221     """
222     Start agent daemon in a background process and set stdout/stderr to
223     /dev/null
224     """
225     devnull = open(os.devnull, 'w')
226     subprocess.Popen([sys.argv[0], '-daemon'], stdout=devnull, stderr=devnull)

[brendandixon]

Addressed by #776