helper script to clean partially installed snap
helper script to clean partially installed snap

Usually `sudo snappy remove <PACKAGE>` should be used,
but if package is partially installed just call:

```
sudo ./snappy-clean.sh <PACKAGE>
```

to clean all related service/configuration files.

devicehive/IoT-framework,devicehive/IoT-framework,devicehive/IoT-framework,devicehive/IoT-framework,devicehive/IoT-framework,devicehive/IoT-framework