Remove copy of ConcurrentLinkedDeque (#956)

* Rely on java.util.concurrent.ConcurrentLinkedDeque instead
* Change ConcurrentPool#prune to use an algorithm that doesn't
  depend on changes to our ConcurrentLinkedDeque copy

JAVA-4630

Author: jyemin

driver-core/src/main/com/mongodb/connection/TlsChannelStreamFactoryFactory.java

@@ -22,7 +22,6 @@
 import com.mongodb.diagnostics.logging.Logger;
 import com.mongodb.diagnostics.logging.Loggers;
 import com.mongodb.internal.connection.AsynchronousChannelStream;
-import com.mongodb.internal.connection.ConcurrentLinkedDeque;
 import com.mongodb.internal.connection.ExtendedAsynchronousByteChannel;
 import com.mongodb.internal.connection.PowerOfTwoBufferPool;
 import com.mongodb.internal.connection.tlschannel.BufferAllocator;
@@ -44,6 +43,7 @@
 import java.nio.channels.SocketChannel;
 import java.security.NoSuchAlgorithmException;
 import java.util.Iterator;
+import java.util.concurrent.ConcurrentLinkedDeque;
 import java.util.concurrent.Future;
 import java.util.concurrent.TimeUnit;
 

driver-core/src/main/com/mongodb/internal/connection/BaseCluster.java

@@ -44,6 +44,7 @@
 import java.util.Deque;
 import java.util.Iterator;
 import java.util.List;
+import java.util.concurrent.ConcurrentLinkedDeque;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.ThreadLocalRandom;
 import java.util.concurrent.atomic.AtomicReference;