Fix the misleading error and the corresponding test case
Reduce the execution time for this test case
Fix valgrind failures on master due to race in new IPC code.
Merge branch 'origin/master'
Merge pull request #786 from VoltDB/ENG-5157-mv-misleading-error

Eng 5157 mv misleading error
Merge branch 'master' of github.com:VoltDB/voltdb into ENG-5177-mv-partitiion-where
Add support for re-aggregation query with where clause