Error on plugging in multiple devices

**Describe the bug**
When you plug in more than 1 hardware wallet into the machine the cli errors out

**Environment information:**

- OS: Mac OS X
- Platform: Darwin 18.5.0 x86_64

**Steps to Reproduce**

1. Plug in 2 hardware wallets
2. Run `skycoin-hw-cli wipe`

**Actual behavior**
```
❯ skycoin-hw-cli wipe
[2019-04-10T21:35:39+05:30] INFO [device-wallet]: Wipe device 26! Answer is: 0806

Unknown message read_common
```

**Expected behavior**
```
❯ skycoin-hw-cli wipe
[2019-04-10T21:35:08+05:30] INFO [device-wallet]: Wipe device 26! Answer is: 0806

Device wiped
```