02a81a5c7f
We need newer docker-compose for functionality like stop_grace_period and the easiest way to get that is via pypi. To install from there we need pip. This also fixes pip3 to work on xenial which doesn't have a python3-distutils package. Change-Id: I5f5431cac7eb191f2f5443892292ca5a236fe1e6
Install system packages for python3 pip and virtualenv
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