When the client detects a validation failure, report what it was doing
at the time.
Two more things:
1) Same prevtxnId issue in doWorkInProcAdhoc
2) rethrow the VoltAbortException in runOne so we still kill the
client.
Merge branch 'master' into ENG-4174
For ENG-4174, add timestamp field to snapshots since transaction ids are no longer timestamps