don't crash if server return error berore initial hello packet

Author: sidorares

lib/connection.js

@@ -114,6 +114,11 @@ function Connection (opts)
     });
     this.addCommand(handshakeCommand);
   }
+
+  // in case there was no initiall handshake but we need to read sting, assume it utf-8
+  // most common example: "Too many connections" error ( packet is sent immediately on connection attempt, we don't know server encoding yet)
+  // will be overwrittedn with actial encoding value as soon as server handshake packet is received
+  this.serverEncoding = 'utf8';
 }
 util.inherits(Connection, EventEmitter);