For ENG-5636, make sure server thread doesn't report running/ready before init is done
Merge pull request #1045 from VoltDB/ENG-5636

For ENG-5636, make sure server thread doesn't report running/ready befor...
Make some of the statistics tests less flaky. Many more are still flaky.
Merge branch 'master' of github.com:VoltDB/voltdb into optimize-null-checking-xin