Better uniquify loxberryid for statistics

[christianTF]

• [ ] Get MAC address of used ethernet interface
• [ ] MD5 the mac
• [ ] Add MD5 on sending loxberryid and plugin install state to loxberry.de

Keep local loxberryid as it is.

[christianTF]

Getting MAC

ip -j link show

results in

[{"ifindex":1,"ifname":"lo","flags":["LOOPBACK","UP","LOWER_UP"],"mtu":65536,"qdisc":"noqueue","operstate":"UNKNOWN","linkmode":"DEFAULT","group":"default","txqlen":1000,"link_type":"loopback","address":"00:00:00:00:00:00","broadcast":"00:00:00:00:00:00"},{"ifindex":2,"ifname":"eth0","flags":["BROADCAST","MULTICAST","UP","LOWER_UP"],"mtu":1500,"qdisc":"pfifo_fast","operstate":"UP","linkmode":"DEFAULT","group":"default","txqlen":1000,"link_type":"ether","address":"b8:27:eb:f5:7b:da","broadcast":"ff:ff:ff:ff:ff:ff"},{"ifindex":3,"ifname":"wlan0","flags":["BROADCAST","MULTICAST"],"mtu":1500,"qdisc":"noop","operstate":"DOWN","linkmode":"DEFAULT","group":"default","txqlen":1000,"link_type":"ether","address":"b8:27:eb:a0:2e:8f","broadcast":"ff:ff:ff:ff:ff:ff"}]