INT-3098 TCP Suppress Error Log on Normal Close

Net connections suppress error logs, NIO connections did not.

Conflicts:

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

Resolved