[iotile-transport-bled112] Getting unnecessary errors if logging is on

If my script uses `logging`, I always get:

```
[22/Jan/2018 17:26:33] ERROR Error stopping scan for devices, error=129
[22/Jan/2018 17:26:33] CRITICAL BLED112 adapter supports 3 connections
```

To test, run:

```
import logging
from iotile.core.hw.hwmanager import HardwareManager

logger = logging.getLogger(__name__)

if __name__ == '__main__':
# Logger Format
logging.basicConfig(level=logging.INFO,
format='[%(asctime)-15s] %(levelname)-6s %(message)s',
datefmt='%d/%b/%Y %H:%M:%S')

with HardwareManager(port='bled112') as hw:
pass
```