Fix miscellaneous prod bugs.

impl/prod/info.go

Index: impl/prod/info.go
diff --git a/impl/prod/info.go b/impl/prod/info.go
index f513f3b04458cbc70720058561634d0b532a34da..ba398dd30616dc66812083d284a8d323fffdea7f 100644
--- a/impl/prod/info.go
+++ b/impl/prod/info.go
@@ -32,7 +32,11 @@ func (g giImpl) AccessToken(scopes ...string) (token string, expiry time.Time, e
 	return appengine.AccessToken(g, scopes...)
 }
 func (g giImpl) AppID() string {
-	return appengine.AppID(g)
+	id := appengine.AppID(g)
+	if appengine.IsDevAppServer() {
+		id = "dev~" + id

[dnj (Google), 2015/08/14 16:08:32]

This primarily affected the key's namespace, which was being derived from and
checked against AppID. On dev_appserver, the key namespace didn't match the
native datastore library's assigned namespace.

Now that I think about it, though, this is probably not correct. AppID is still
the same; just the "aid" value for the key is wrong. I'll update to apply this
logic in the "aid" generation.

+	}
+	return id
 }
 func (g giImpl) GetNamespace() string {
 	return g.Value(namespaceCopyKey).(string)