Fixed some typos in melted-node-driver

Signed-off-by: Juan Martin Runge <jmrunge@gmail.com>
Added isConnected method to mvcp driver and melted node driver

Signed-off-by: Juan Martin Runge <jmrunge@gmail.com>
Modified mvcp driver test to use isConnected function

Signed-off-by: Juan Martin Runge <jmrunge@gmail.com>