Dont log error in case of eof error for async_read
Dont log error in case of eof error for async_read

async_read returns eof to indicate that the other side has closed the socket.
This is a way for other side to know that socket should be closed now. There
is no need to log since it is not an error condition
Closes-Bug: 1506795

Change-Id: Iee04f8ff2ac99cf66275b1f3bc58c749ed344021

nischalsheth/contrail-controller,eonpatapon/contrail-controller,tcpcloud/contrail-controller,codilime/contrail-controller,tcpcloud/contrail-controller,codilime/contrail-controller,nischalsheth/contrail-controller,rombie/contrail-controller,nischalsheth/contrail-controller,tcpcloud/contrail-controller,eonpatapon/contrail-controller,rombie/contrail-controller,codilime/contrail-controller,codilime/contrail-controller,tcpcloud/contrail-controller,eonpatapon/contrail-controller,rombie/contrail-controller,nischalsheth/contrail-controller,tcpcloud/contrail-controller,nischalsheth/contrail-controller,rombie/contrail-controller,codilime/contrail-controller,nischalsheth/contrail-controller,tcpcloud/contrail-controller,eonpatapon/contrail-controller,nischalsheth/contrail-controller,rombie/contrail-controller,rombie/contrail-controller,eonpatapon/contrail-controller,codilime/contrail-controller,eonpatapon/contrail-controller,rombie/contrail-controller,nischalsheth/contrail-controller,eonpatapon/contrail-controller