I had a couple questions about ZooKeeper watches that weren't immediately
clear from the programmer's guide
1. If my session has a default watcher w, and I make a call that sets
another watcher w' for a specific znode, will both w and w' get called if
the znode changes?
2. If my session expires, on reconnect willl both w and w' be notified
of the session expiry or just w?