Remove info prints in connection_state function

[smicker]

When connected directly to the drone, without a skycontroller, you don't have a callback for the drone connection state. In this case it could be useful to instead pull the state by calling the drone.connection_state() to check the drone connection. But for every call to this function it will print "connected to the drone" if the drone is connected. It will bloat the console to much.
Can those INFO prints be completely removed?