This commit includes example tutorials and solutions for P4D2 2017. (#29)

- Added example P4 programs for ipv4_forwarding, mri, arp, calc
- Added python code to invoke compiler, start bmv2, run mininet
- Added solutions to above programs
- Added README files that describe exercises

P4D2_2017/exercises/ipv4_forward/run.sh

@@ -0,0 +1,5 @@
+P4APPRUNNER=../../utils/p4apprunner.py
+mkdir -p build
+tar -czf build/p4app.tgz * --exclude='build'
+#cd build
+sudo python $P4APPRUNNER p4app.tgz --build-dir ./build