Updates based on tests on RPI 1

[ciotlosm]

Find some changes and hacks to make it work on RPI1

Things to do:

• Allow mqtt host to be configurable to remove the need for "host_network": true
• Make the db map to a folder that is sitting on the host (I think /data) to avoid losing all data on addon restart - maybe make it absolute path and add it as option
• Expose permit_join to allow turning it off from the interface
• Make proper use of the version to avoid "latest" version hack that causes stacktrace
• Auto restart when addon stops because of zigbee-shepherd bug Error when paired device is not known zigbee2mqtt#29 ? Or maybe find a better way of error handling this inside the library to avoid a total crash of the process?
• Allow device path /dev/ttyACM0 to be configurable - is the config: "devices": ["/dev/ttyACM0:/dev/ttyACM0:rwm"] needed ?

[ciotlosm]

This is a hack because it uses the version to fetch the image from docker hub based on a tag matching this version.
With latest the image is pulled, but there is a stacktrace on start:

18-05-10 17:50:25 ERROR (MainThread) [aiohttp.server] Error handling request
Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/aiohttp/web_protocol.py", line 381, in start
    resp = await self._request_handler(request)
  File "/usr/lib/python3.6/site-packages/aiohttp/web_app.py", line 322, in _handle
    resp = await handler(request)
  File "/usr/lib/python3.6/site-packages/aiohttp/web_middlewares.py", line 88, in impl
    return await handler(request)
  File "/usr/lib/python3.6/site-packages/hassio/api/security.py", line 48, in token_validation
    return await handler(request)
  File "/usr/lib/python3.6/site-packages/hassio/api/utils.py", line 33, in wrap_api
    answer = await method(api, *args, **kwargs)
  File "/usr/lib/python3.6/site-packages/hassio/addons/utils.py", line 33, in wrap_check
    return await method(addon, *args, **kwargs)
  File "/usr/lib/python3.6/site-packages/hassio/addons/addon.py", line 652, in start
    return await self.instance.run()
  File "/usr/lib/python3.6/site-packages/hassio/utils/__init__.py", line 25, in wrap_api
    return await method(api, *args, **kwargs)
  File "/usr/lib/python3.6/concurrent/futures/thread.py", line 56, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/usr/lib/python3.6/site-packages/hassio/docker/addon.py", line 263, in _run
    self.image, self.version)
  File "/usr/lib/python3.6/site-packages/hassio/docker/addon.py", line 47, in version
    return super().version
  File "/usr/lib/python3.6/site-packages/hassio/docker/interface.py", line 45, in version
    if self._meta and LABEL_VERSION in self._meta['Config']['Labels']:
TypeError: argument of type 'NoneType' is not iterable
``

[ciotlosm]

This is added until we can inject mqtt configuration

[ciotlosm]

I will close this pull request for now because will use https://github.com/danielwelch/hassio-zigbee2mqtt for more development until a stable version is released.