Make pip not error in build job.
Make pip not error in build job.

[#156864505]

Signed-off-by: Leah Hanson <59915d4d5a651c1df4fd522b917423b47c84f68b@pivotal.io>

cloudfoundry/buildpacks-ci,cloudfoundry/buildpacks-ci,cloudfoundry/buildpacks-ci,cloudfoundry/buildpacks-ci,cloudfoundry/buildpacks-ci