Use sudo when editing /etc/pip.conf
Use sudo when editing /etc/pip.conf

Unlike before where the jenkins user was editing files that it owns in
its homedir the /etc/pip.conf editing needs root permissions since that
file is owned by root.

Change-Id: I485a08cb243cc0abf4c848e6061606b4320a59cb

dongwenjuan/project-config,Tesora/tesora-project-config,openstack-infra/project-config,Tesora/tesora-project-config,citrix-openstack/project-config,noorul/os-project-config,open-switch/infra_project-config,open-switch/infra_project-config,anbangr/osci-project-config,citrix-openstack/project-config,noorul/os-project-config,coolsvap/project-config,coolsvap/project-config,anbangr/osci-project-config,dongwenjuan/project-config,openstack-infra/project-config