Added MOTD that explains how to run an example within the emulator VM
diff --git a/utils/vagrant/motd b/utils/vagrant/motd
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+************************************************************
+** Welcome to SONATA's son-emu VM **
+** http://sonata-nfv.eu **
+** **
+** To run the emulator with a simple example topology **
+** and its fake-gatekeeper run the following commands. **
+** **
+** Switch to example folder: **
+** - cd son-emu/src/emuvim/examples **
+** **
+** Start the emulator with SONATA's example topology: **
+** - sudo python sonata_y1_demo_topology_1.py **
+** **
+** The emulator will be started and the fake-gatekeeper **
+** API will be accessible on port 5000 from both, the **
+** VM and your host machine. **
+************************************************************
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