TempVolume tweaks. Test for volume full when sorting.
Failing test with injected exception
Don't leak temp volumes if Exchange construction fails
Knock logging down to debug
Pass Session to mutating methods of TableStatus
merge nwilliams: Release, and close if unshared, temporary volumes for all exception scenarios.

https://code.launchpad.net/~nwilliams/akiban-server/fix-temp-volume-leak/+merge/168262
merge nwilliams: Pass Session to any mutating methods of TableStatus.

https://code.launchpad.net/~nwilliams/akiban-server/session-to-table-status/+merge/168477