Add tests for SC byzantine dataloss and tree loss

This is the first iteration of creating byzantine dataloss tests that
show both recoverable and unrecoverable, but detectable errors. This tests the
following scenarios.

 * Lose one partition worth of data, but no synctrees and recover.
 * Lose all but one partition of ensemble data, but no synctrees and
   recover.
 * Lose minority of synctrees. Only the peers with the missing
   synctrees are restarted. System remains available.
 * Loss of majority of synctrees. Majority peers are restarted. System
   recovers when they all come back online.
 * Loss of majority of synctrees with one node partitioned. All peers
   restarted except partitioned one. System does not recover with that
   node partitioned. When the partition is healed the system recovers.
 * Loss of all data and synctree except on one peer recovers.
 * Backing up and restoring old data but not synctrees results in
   detected errors. Restoring newer data fixes this.
 * Delete all data on all nodes, but not synctrees. This is detected and
   an error returned to the user.
@reiddraper The worst thing it could do is delete "/data/bitcask" I suppose. @seancribbs I will take a look at the partition repair tests and crib from there for safety. I should have realized this already existed. I'll push a change soon.