Updating tower topology for the tutorial.
Updating tower topology for the tutorial.

Change-Id: I860580a1128f34cef8151714893d25b707221730

kuujo/onos,opennetworkinglab/onos,oplinkoms/onos,kuujo/onos,opennetworkinglab/onos,gkatsikas/onos,kuujo/onos,opennetworkinglab/onos,oplinkoms/onos,opennetworkinglab/onos,oplinkoms/onos,oplinkoms/onos,opennetworkinglab/onos,gkatsikas/onos,gkatsikas/onos,opennetworkinglab/onos,kuujo/onos,kuujo/onos,gkatsikas/onos,kuujo/onos,gkatsikas/onos,oplinkoms/onos,gkatsikas/onos,oplinkoms/onos,oplinkoms/onos,kuujo/onos