Point integration lacks support for multiple devices

[gnaeser]

Home Assistant release with the issue:

0.83.2

Last working Home Assistant release (if known):
Has never worked.

Operating environment (Hass.io/Docker/Windows/etc.):

General

Component/platform:

Minut Point

Description of problem:
Only the first Point in the user's Minut account will be added through the integration (the one first in the list returned when querying https://api.minut.com/draft1/devices).

Traceback (if applicable):

2018-12-03 03:23:58 ERROR (MainThread) [homeassistant.config_entries] Error setting up entry [email protected] for sensor
Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/homeassistant/config_entries.py", line 248, in async_setup
    result = await component.async_setup_entry(hass, self)
  File "/usr/local/lib/python3.6/site-packages/homeassistant/components/sensor/__init__.py", line 48, in async_setup_entry
    return await hass.data[DOMAIN].async_setup_entry(entry)
  File "/usr/local/lib/python3.6/site-packages/homeassistant/helpers/entity_component.py", line 134, in async_setup_entry
    raise ValueError('Config entry has already been setup!')
ValueError: Config entry has already been setup!

The above will be logged once for sensor, as shown, and once for binary_sensor for each Point not added. If you have three points the log will contain two errors for sensors and two for binary_sensors.