Create new Source Based Routing plugin

This creates a new plugin (sbr) which sets up source based routing, for use
as a chained plugin for multi-network environments.

plugins/meta/sbr/sbr_suite_test.go

@@ -0,0 +1,15 @@
+// The boilerplate needed for Ginkgo
+
+package main
+
+import (
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+
+	"testing"
+)
+
+func TestSample(t *testing.T) {
+	RegisterFailHandler(Fail)
+	RunSpecs(t, "plugins/sbr")
+}