For the hassbian install, you typically would have to only run the Open Zwave install script (which takes awhile). You should not have to manipulate the dialout group. You would typically only need three lines in your config to make this work:
zwave:
usb_path: /dev/ttyACM0
config_path: /srv/homeassistant/lib/python3.4/site-packages/libopenzwave-0.3.2-py3.4-linux-armv7l.egg/config
Check to make sure that the config_path directory exists by using “cd” on the commandline. Your config_path could be different, so drill down to see if you can get to the config directory like the path above. If yes, try those three lines in your config. If no, replace it with whatever path you can drill down to that ends in /config…
Again, I am just guessing here, but that is the path that I used for my last hassbian install…