Fixed: were sending out of date size info on commit

Because we were computing the size info in the commit callback, which
might be before before the inderlying data were committed.  This caused the computation to be wrong in some cases.

Instead we get and send the size information after committing.

src/ZEO/StorageServer.py

@@ -358,6 +358,7 @@ class ZEOStorage:
 
         self.stats.commits += 1
         self.storage.tpc_finish(self.transaction, self._invalidate)
+        self.connection.async('info', self.get_size_info())
         # Note that the tid is still current because we still hold the
         # commit lock. We'll relinquish it in _clear_transaction.
         tid = self.storage.lastTransaction()
@@ -366,8 +367,7 @@ class ZEOStorage:
 
     def _invalidate(self, tid):
         if self.invalidated:
-            self.server.invalidate(self, self.storage_id, tid,
-                                   self.invalidated, self.get_size_info())
+            self.server.invalidate(self, self.storage_id, tid, self.invalidated)
 
     def tpc_abort(self, tid):
         if not self._check_tid(tid):