Tear down agents properly at EOD in full restore

The restore engine wasn't tearing down the bound agent after reaching
the end of data for the app, and furthermore was allowing the restore
operation to resume running the queue before all data had been delivered
to the current target.

Also make LocalTransport deliver data in 2K chunks rather than 32K,
as a first step towards making its timing characteristics more like
we'll see in networked situations.

Finally, added a bunch of MORE_DEBUG output for finding odd bugs
like this.

Change-Id: Icdbe6a070af6cc7c708a938ad044108d40ebce9a