Check to make sure all switches on the path are active before establishing a...

Check to make sure all switches on the path are active before establishing a flow-mod.  Add a unit test to verify this is the behavior.

src/main/java/net/floodlightcontroller/core/IOFSwitch.java

@@ -364,7 +364,7 @@ public interface IOFSwitch {
     public boolean isConnected();
 
     /**
-     * Check if the switch is active. I.e., the switch is conencted to this
+     * Check if the switch is active. I.e., the switch is connected to this
      * controller and is in master role
      * @return
      */