Allow for error-free build via `go github.com/lightningnetwork/lnd/...`

[PaulCapestany]

Not a big deal, but figured I might as well post this issue.

Currently the uspv package has these build errors:

uspv/eight333.go:21: undefined: wire.TestNetL
uspv/eight333.go:26: undefined: chaincfg.TestNetLParams

Other than that, only other package build issues I think others would run into when trying to do a go get of the .../... variety is the too many errors flavor of error in lnstate

[Roasbeef]

Thanks! I've fixed the build errors with these three commits.

We'll have an automated travis-ci build-bot linked to the repo up soon.