--allow-all-external is required for pip
--allow-all-external is required for pip

At least one of the packages, argparse, is currently can't
be installed by simple 'pip install argparse==1.2.1'. To be
able to install it from external sources, --allow-all-external
option to pip can be used

Change-Id: Ib7199dca14b9bf471fb986b3ef4b805d22372a09
Closes-Bug: #1299678

zhaochao/fuel-web,zhaochao/fuel-web,nebril/fuel-web,koder-ua/nailgun-fcert,zhaochao/fuel-web,stackforge/fuel-web,koder-ua/nailgun-fcert,nebril/fuel-web,huntxu/fuel-web,koder-ua/nailgun-fcert,prmtl/fuel-web,prmtl/fuel-web,SmartInfrastructures/fuel-web-dev,zhaochao/fuel-web,nebril/fuel-web,eayunstack/fuel-web,nebril/fuel-web,zhaochao/fuel-web,stackforge/fuel-web,stackforge/fuel-web,prmtl/fuel-web,prmtl/fuel-web,eayunstack/fuel-web,huntxu/fuel-web,eayunstack/fuel-web,huntxu/fuel-web,SmartInfrastructures/fuel-web-dev,koder-ua/nailgun-fcert,eayunstack/fuel-web,SmartInfrastructures/fuel-web-dev,SmartInfrastructures/fuel-web-dev,eayunstack/fuel-web,nebril/fuel-web,huntxu/fuel-web,SmartInfrastructures/fuel-web-dev,prmtl/fuel-web,huntxu/fuel-web