OF-857: Fix C2S locking issues

Updates the MINA 2.0.9 core to fix a locking issue documented here:
https://issues.apache.org/jira/browse/DIRMINA-995

Also updates connection manager and thread pool configurations to better
allocate resources within the JVM.
Merge pull request #133 from tevans/OF-857

OF-857: Fix C2S locking issues