Brooklyn node and cluster upgrade

Merges #266 (cluster upgrade) with work I've been doing on node upgrade.

Builds on #260 so please ensure that is merged first.

Needs further testing (by me at this point) but wanted to push it in case @neykov you have comments, especially on the last commit.
fixed the test.  the problem was that we were queueing a task in a finally block after a previous queued task failed.  fixed it by saying to `DynamicTasks.swallowChildrenExceptions()`.