Closes-Bug: #1404940

-> Enhances task 'prov_esxi' to spawn contrail compute VM on the ESX server
-> Adds vmx template for contrail compute VM
-> Adds sample testbed file for ESXI based setup

Change-Id: Ibea2a23c736b021afe1f415c46dbf02cde5084e5
Merge "Closes-Bug: #1404940" into R2.0