Add python's native support for bluetooth sockets

[sergioisidoro]

Python 3 has native support for bluetooth sockets, with socket family AF_BLUETOOTH

However, it only has support for it if built with bluetooth.h in the dependencies

Before:

Python 3.7.6 (default, Dec 20 2019, 22:36:14) 
[GCC 8.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from socket import AF_BLUETOOTH"
  File "<stdin>", line 1
    from socket import AF_BLUETOOTH"
                                   ^
SyntaxError: EOL while scanning string literal
>>> from socket import AF_BLUETOOTH
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: cannot import name 'AF_BLUETOOTH' from 'socket' (/usr/local/lib/python3.7/socket.py)

Expected after:

Python 3.7.6 (default, Dec 21 2019, 23:33:58) 
[GCC 8.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from socket import AF_BLUETOOTH
>>> AF_BLUETOOTH
<AddressFamily.AF_BLUETOOTH: 31>
>>> 

⚠️ This assumes the python images are only built in an alpine environment

For Ubuntu / Debian environment, the lib to install before building python is libbluetooth-dev