Add Lutron Caseta discovery

[upsert]

Adding support for Lutron Caseta Smart Bridge and Smart Bridge Pro, which support mDNS for discovery.

Here is sample output from netdisco:

lutron:
[{'host': '192.168.2.11',
  'hostname': 'Lutron-a0f6fdXXXXXX.local.',
  'port': 22,
  'properties': {'CODEVER': '04.03.05f000',
                 'DEVCLASS': '08050100',
                 'FW_STATUS': '1:NoUpdate',
                 'MACADDR': 'a0:f6:fd:XX:XX:XX',
                 'NW_STATUS': '11:InternetWorking',
                 'ST_STATUS': 'good'}}]

Lutron may also be using mDNS for the Lutron Connect Bridge (CONNECT-BDG2) for RadioRA 2 and/or the Staples Connect hub, but I only have the Smart Bridge Pro 2 for testing. When discovery is implemented in Home Assistant for Lutron Caseta, it should check the DEVCLASS property for a compatible device.

For reference purposes, here is a table of the DEVCLASS values for Lutron Caseta devices that should be supported by the Caseta component in HA:

Device	Model	DEVCLASS
Smart Bridge	L-BDG-WH	08040000
Smart Bridge 2	L-BDG2-WH	08040100
Smart Bridge Pro	L-BDGPRO-WH	08050000
Smart Bridge Pro 2	L-BDGPRO2-WH	08050100

[balloob]

Awesome, thanks 🐬