Added insertion of default table-miss flow for OF1.3 switches. Also added...

Added insertion of default table-miss flow for OF1.3 switches. Also added clearing of switch tables when switch connects. Both of these only occur if the controller is in the MASTER role for the switch. It if is placed in SLAVE, the switch flow tables will not be modified. Also had to update the unit tests with new expectations for IOFSwitchBackend fuction calls (which was a real pain).