[FEATURE] Add MAC / host name to unnamed device name

[johannrichard]

Describe the feature requested
Most devices from myStrom don't let the user set a name directly on the device. In Order to make them more recognisable (and in line with their own naming), we should use the MAC address (or parts thereof) when setting the name in HomeKit.

Examples and context

e.g. a myStrom-Switch-F00BAD would be named the same or myStrom Switch F00BAD.

Alternatively, the host name could be resolved and if something meaningful is returned, could be used.

E.g. kitchen.my.local would be named Kitchen.