Fix pip installation on Python 2 environments
Fix pip installation on Python 2 environments

The latest versions of pip do not support Python 2, which causes
a problem in our CI when we try to install it using easy_install.

This patches fixes that by using the get-pip.py script from [1].

[1] - https://bootstrap.pypa.io/2.7/get-pip.py

Change-Id: I1ed4919f61a92e51f006feeea7f225ada3958baa

openstack-packages/DLRN,openstack-packages/delorean,openstack-packages/DLRN,openstack-packages/delorean