clean up several variable name inconsistencies
For ENG-4797, fetch all available .hprof and hs_err files regardless of PID
For ENG-4999, unit test of log collector
For ENG-4999, use volt to generate JVM crash and voltdb crash file in unit test
For ENG-4999, reorganize unit test
For ENG-4999, adjustments corresponding to changes in VEM
add a comment
Merge remote-tracking branch 'origin/master' into ENG-4999
For ENG-4999, revise unit test on heapdump file
Merge pull request #695 from VoltDB/ENG-4999

Eng 4999
Merge branch 'master' of github.com:VoltDB/voltdb into ENG-3613-complex-groupby-mv
Refix for Paul's review