Fix miscellaneous prod bugs.

service/datastore/checkfilter.go

Index: service/datastore/checkfilter.go
diff --git a/service/datastore/checkfilter.go b/service/datastore/checkfilter.go
index 2dd9ea3b520db3c7221907f96dccbfa41556e849..83c7fdff0e5a0397cb9e83c4cdb879582ca86e18 100644
--- a/service/datastore/checkfilter.go
+++ b/service/datastore/checkfilter.go
@@ -117,5 +117,9 @@ func (tcf *checkFilter) DeleteMulti(keys []Key, cb DeleteMultiCB) error {
 
 func applyCheckFilter(c context.Context, i RawInterface) RawInterface {
 	inf := info.Get(c)
-	return &checkFilter{i, inf.AppID(), inf.GetNamespace()}
+	aid := inf.AppID()
+	if inf.IsDevAppServer() {
+		aid = "dev~" + aid
+	}

[iannucci, 2015/08/15 21:50:54]

This is the wrong place to apply this. memory.info.AppID should return this
directly.

[dnj (Google), 2015/08/16 06:11:06]

The actual AppID (as returned by appengine.AppID()) does _not_ have the "dev~"
prefix. It's just prepended to the keys generated by "appengine". Adjusting the
formal AppID would be wrong in this case.

What's happening is:
1) GAE is asking "appengine" layer to create a key. "appengine" does so, using
AppID and prepending "dev~".
2) Fine so far, GAE translates that key into a valid GAE key, cool.
3) checkfilter says, "hey key, you're supposed to have info.AppID(). You fail
teh chex."

So everything is great except for checkFilter's idea of what the AppID should
be. That's why I put this logic here.

+	return &checkFilter{i, aid, inf.GetNamespace()}
 }