Add VersionID to impl/memory info service implementation

impl/memory/info.go

Index: impl/memory/info.go
diff --git a/impl/memory/info.go b/impl/memory/info.go
index 4f8fb8b43aef0a1fba518ad290ebbeedbddc4bac..811e586c3ebdb459bef06e20e4a2fc0ec32ac9de 100644
--- a/impl/memory/info.go
+++ b/impl/memory/info.go
@@ -67,3 +67,9 @@ func (gi *giImpl) FullyQualifiedAppID() string {
 func (gi *giImpl) IsDevAppServer() bool {
 	return true
 }
+
+func (gi *giImpl) VersionID() string {
+	// VersionID returns X.Y where Y is autogenerated by appengine, and X is
+	// whatever's in app.yaml.
+	return "testVersionID.1"
+}