Fix TimeUnit in ChannelInputStream.close()

The `TcpNioConnection.ChannelInputStream.close()` uses wrongly `TimeUnit.SECONDS`
for the `pipeTimeout` in the `this.buffers.offer()` call.

* The `TimeUnit.MILLISECONDS` must be used instead

**Cherry-pick to 5.1.x, 5.0.x, 4.3.x**

spring-integration-ip/src/main/java/org/springframework/integration/ip/tcp/connection/TcpNioConnection.java

@@ -761,7 +761,7 @@ public class TcpNioConnection extends TcpConnectionSupport {
 			super.close();
 			this.isClosed = true;
 			try {
-				this.buffers.offer(EOF, TcpNioConnection.this.pipeTimeout, TimeUnit.SECONDS);
+				this.buffers.offer(EOF, TcpNioConnection.this.pipeTimeout, TimeUnit.MILLISECONDS);
 			}
 			catch (InterruptedException e) {
 				Thread.currentThread().interrupt();