ENG-7325 sqlcmd refactor
Fix sqlcmd false error code after using stdin.
Merge branch 'master' into ENG-7325-sqlcmd-refactor-squashed
Merge pull request #1876 from VoltDB/ENG-7325-sqlcmd-refactor-squashed

Eng 7325 sqlcmd refactor squashed - will address review feedback w/ future commits.
Add jackson to eclipse classpath
ENG-7348 add timeout diagnostics to TestSqlCmdErrorHandling
aggregation benchmarks: change to average all iterations; change method of measurement to reduce overhead
Merge remote-tracking branch 'upstream/master'