Add Dockerfile and make-based tooling

Change-Id: I6471c3bc2040a0a9c9c49b45beee6fcd11c77a3c
diff --git a/bbsim.go b/bbsim.go
index 2c3a15d..28ab99f 100755
--- a/bbsim.go
+++ b/bbsim.go
@@ -17,9 +17,9 @@
 package main
 
 import (
-	"./openolt"
 	"log"
 	"net"
+	"gerrit.opencord.org/voltha-bbsim/openolt"
 	"google.golang.org/grpc"
 	"fmt"
 	"flag"