Disable IOException warning when driver is disconnected from the routers

[savinov]

When driver is disconnected from the routers (session timeout) we don't want to see IOException warning in log. INFO messages about connect/disconnect events should not be disabled.

2021-03-16 12:47:47.698  INFO 1 --- [ntLoopGroup-2-2] .t.d.c.TarantoolClusterConnectionManager : Disconnected from some-server

2021-03-16 12:47:47.696  WARN 1 --- [ntLoopGroup-2-2] io.netty.channel.DefaultChannelPipeline  : An exceptionCaught() event was fired, and it reached at the tail of the pipeline. It usually means the last handler
 in the pipeline did not handle the exception.

java.io.IOException: Connection reset by peer
        at java.base/sun.nio.ch.FileDispatcherImpl.read0(Native Method) ~[na:na]
        at java.base/sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:39) ~[na:na]
        at java.base/sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:276) ~[na:na]
        at java.base/sun.nio.ch.IOUtil.read(IOUtil.java:233) ~[na:na]
        at java.base/sun.nio.ch.IOUtil.read(IOUtil.java:223) ~[na:na]
        at java.base/sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:358) ~[na:na]
        at io.netty.buffer.PooledByteBuf.setBytes(PooledByteBuf.java:253) ~[netty-all-4.1.52.Final.jar!/:4.1.52.Final]
        at io.netty.buffer.AbstractByteBuf.writeBytes(AbstractByteBuf.java:1133) ~[netty-all-4.1.52.Final.jar!/:4.1.52.Final]
        at io.netty.buffer.WrappedByteBuf.writeBytes(WrappedByteBuf.java:821) ~[netty-all-4.1.52.Final.jar!/:4.1.52.Final]
        at io.netty.channel.socket.nio.NioSocketChannel.doReadBytes(NioSocketChannel.java:350) ~[netty-all-4.1.52.Final.jar!/:4.1.52.Final]
        at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:151) ~[netty-all-4.1.52.Final.jar!/:4.1.52.Final]
        at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:714) ~[netty-all-4.1.52.Final.jar!/:4.1.52.Final]
        at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:650) ~[netty-all-4.1.52.Final.jar!/:4.1.52.Final]
        at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:576) ~[netty-all-4.1.52.Final.jar!/:4.1.52.Final]
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493) ~[netty-all-4.1.52.Final.jar!/:4.1.52.Final]
        at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989) ~[netty-all-4.1.52.Final.jar!/:4.1.52.Final]
        at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) ~[netty-all-4.1.52.Final.jar!/:4.1.52.Final]
        at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) ~[netty-all-4.1.52.Final.jar!/:4.1.52.Final]
        at java.base/java.lang.Thread.run(Thread.java:834) ~[na:na]