This fixes behavior when command hw-type failed to detect which model
are Turris 1.x routers.

Before:
```
root@turris:~# crypto-wrapper hw-type
crypto-wrapper: error: Unknown device model: 'Turris 1.x'
```

After:
```
root@turris:~# crypto-wrapper hw-type
atsha
```

The model is taken from /tmp/sysinfo/model (row 15), this returns:
```
root@turris:~# cat /tmp/sysinfo/model
Turris 1.x
```

- Convert Serial numberr to uppercase
- Convert MAC address to lowercase

Also move checks into wrapper functions