Low the number of threads created in the stress test since it uses up all resources on older windows.
Low the number of threads created in the stress test since it uses up all resources on older windows.

git-svn-id: 0fb8a5a922afe2085ae9a967a0cf0864fe09ecff@1411803 13f79535-47bb-0310-9956-ffa450edef68

apache/activemq-cpp,apache/activemq-cpp,apache/activemq-cpp,apache/activemq-cpp