Error on plugging in multiple devices

[isaacvr]

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