Updates the examples to use the new build scripts (except Hula). (#74)

* Added Makefile and topology.jsons for all examples.

* use branch

* Updated MRI exercise (#73)

* Updated MRI exercise

* Updated basic_tunnel.p4 for changes to p4 lang

* updated other examples

P4D2_2017_Fall/vm/user-bootstrap.sh

@@ -111,6 +111,7 @@ cd ..
 # Tutorials
 pip install crcmod
 git clone https://github.com/p4lang/tutorials
+git checkout p4d2_2017_fall
 sudo mv tutorials /home/p4
 sudo chown -R p4:p4 /home/p4/tutorials