Fix tokenMap initialization at startup (JAVA-415).

This reverts the `dontReloadNodeInfo` boolean that was added to `ControlConnection#refreshSchema` as part of JAVA-315 to avoid calling `refreshNodeListAndTokenMap` twice at startup.

It turns out that we want to call it a second time, because the first time it is called the token map cannot be built since the keyspaces have not been loaded yet.