HotRod client should only log ERROR when it cannot failover

In the Hot Rod client, if an error occurs connecting to a server, an ERROR is logged

2011-05-17 07:48:42,000 312441 ERROR [org.infinispan.client.hotrod.impl.transport.tcp.TcpTransport] (Runner - 0 Could not connect to server: perf19/10.16.90.56:11222

However, this is not necessarily an ERROR unless you've run out of nodes and you cannot failover. So this should be a WARN and only log ERROR if you can't
failover any more