refactor-for-testability (#3)

Co-authored-by: jdl <jdl@desktop>
Co-authored-by: jdl <jdl@crumpington.com>
Reviewed-on: #3

cmd/vppn/main.go

@@ -2,10 +2,10 @@ package main
 
 import (
 	"log"
-	"vppn/node"
+	"vppn/peer"
 )
 
 func main() {
 	log.SetFlags(0)
-	node.Main()
+	peer.Main()
 }