Add method to shutdown all connections All connections are closed and the method waits until the connection threads are terminated. Change-Id: I079d216bd7a101514fbe10b1f1542e7033f8ea6e git-svn-id: https://svn.apache.org/repos/asf/etch/trunk@1679594 13f79535-47bb-0310-9956-ffa450edef68