In this commit, we update the release script to include a directory
containing all of our vendored dependencies. This makes out releases
more self contained as they can be built using `go build -mod=vendor`
without requiring any package fetching.
Additionally, we pacakge the entire source as well.
Fixes#1550.
In this commit we update the release script to properly include the
commit hash in compiled binaries of lnd and lncli. In the future, we
should ditch the release script and extend the Makefile to support this
use case.
Fixes#2389.
