Single USB-connected Tessel should be selected when "--usb" specified

[flaki]

Now when I only have several Tessels around, but only a single one connected over USB:

flaki$ t2 list
INFO Searching for nearby Tessels...
    tessel-europe   USB 
    hip-hardware    LAN (USB connect and run `tessel provision` to authorize)
    JonnyTessel LAN (USB connect and run `tessel provision` to authorize)
    navi    LAN (USB connect and run `tessel provision` to authorize)
INFO Multiple Tessels found.
INFO Set default Tessel with environment variable (e.g. 'export TESSEL=bulbasaur') or use the --name flag.

...specifying --usb returns a "Multiple possible Tessel connections found." error, while in reality there is only a single one connected via USB:

flaki$ t2 wifi --usb -l
INFO Looking for your Tessel...
INFO Please specify a Tessel by name [--name <tessel name>]
WARN Multiple possible Tessel connections found.

[johnnyman727]

This is definitely an issue with the runHeuristics function that controller.js uses to figure out which Tessel you want.

[johnnyman727]

Fixed with #360.