Ensure that new sources don't try to connect to old workers #2004
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This was caused by two issues:
When a DataReceiver was disposed (when a worker leaves the
cluster, it calls dispose() on all DataReceivers), it wasn't
telling its corresponding Boundary that it's out for good.
So the Boundary kept trying to reconnect.
When new sources connected after a shrink, they were given
outdated boundary builders. This led them to try to connect
to workers that were no longer part of the cluster.
This commit fixes both.
Closes #2001