Adapting p4c and bmv2 setup script for 14.04 and 16.04
Adapting p4c and bmv2 setup script for 14.04 and 16.04

At the time of commit on a 4 core VM running on VirtualBox on
a 2016 MacBook Pro takes the following amount of time:
  Ubuntu 16.04 - 19m13.451s
  Ubuntu 14.04 - 21m58.665s

Change-Id: I06960d8f27883dab518363678c8bcbf3fee94382

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