Allow operators to override use of get-pip.py
Allow operators to override use of get-pip.py

Operators may not want to run get-pip.py from an external source.

TrivialFix

Change-Id: I591b0cef135f9e1e3054c48c93a17b7b74fd0a9a

stackforge/kolla,mandre/kolla,rahulunair/kolla,nihilifer/kolla,dardelean/kolla-ansible,rahulunair/kolla,nihilifer/kolla,openstack/kolla,mrangana/kolla,intel-onp/kolla,dardelean/kolla-ansible,mrangana/kolla,stackforge/kolla,coolsvap/kolla,dardelean/kolla-ansible,intel-onp/kolla,openstack/kolla,GalenMa/kolla,coolsvap/kolla,coolsvap/kolla,GalenMa/kolla,stackforge/kolla,mandre/kolla,mandre/kolla