(THRIFT-5) A TNonblockingServers (single-threaded and thread-pool) for Java

(THRIFT-5) A TNonblockingServers (single-threaded and thread-pool) for Java

This patch adds two Thrift servers for Java that both use non-blocking I/O
to avoid locking up worker threads for idle connections.  The two classes are
- TNonblockingServer, which supports single-threaded serving
- THsHaServer, which performs I/O in one thread and method invocations in
  a configurable thread pool.
To support these servers, TNonblockingServerSocket and TNonblockingSocket
have been added.

git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@673550 13f79535-47bb-0310-9956-ffa450edef68