Merge branch 'lazy_umount' into 'master'

added -l to umount commands

the log folder is not deleted, because the **umount** command needs to be lazy, that's why we added the **-l** argument.

```
Tue Mar 21 23:59:01 UTC 2017 umount: /home/0/57/log: target is busy
Tue Mar 21 23:59:01 UTC 2017 (In some cases useful info about processes that
Tue Mar 21 23:59:01 UTC 2017 use the device is found by lsof(8) or fuser(1).)
Tue Mar 21 23:59:01 UTC 2017 rm: cannot remove '/home/0/57/log': Device or resource busy
```

See merge request !561