For ENG-4763, use larger stack size in SingleThreadExecutor to avoid StackOverflowError when remote database is down
For ENG-4763, add apache tomcat connection pool to the third party readme
For ENG-4763, add tomcat to lib directory
modify parameter of getSingleThreadExecutor method
Merge pull request #594 from VoltDB/ENG-4763-D

Eng 4763 d