Add DefaultVersionHostname to impl/memory/info.

impl/memory/info.go

Index: impl/memory/info.go
diff --git a/impl/memory/info.go b/impl/memory/info.go
index fc1b2bf055cd2fa990e5720f6d84324dff831bcf..c4d5950efe4857f5a1a8c34d5445b92ee6374ac1 100644
--- a/impl/memory/info.go
+++ b/impl/memory/info.go
@@ -106,6 +106,10 @@ func (gi *giImpl) FullyQualifiedAppID() string {
 	return gi.fqAppID
 }
 
+func (gi *giImpl) DefaultVersionHostname() string {
+	return fmt.Sprintf("%s.appspot.com", gi.appID)

[dnj (Google), 2016/06/02 04:07:11]

WDYT about using "example.com"-style domain here? I'm wary of emitting a
potentially-real domain.

[iannucci, 2016/06/02 22:34:58]

good call. changed to example.com.

+}
+
 func (gi *giImpl) IsDevAppServer() bool {
 	return true
 }