rdo2: newton, cache image script is looking in the wrong place.

[Matt Young]

A change was made to the script used by rdo2 to cache RDO images from images.rdoproject.org that broke newton jobs.

http://git.app.eng.bos.redhat.com/git/tripleo-environments.git/commit/ci-scripts/cache-rdo-image.sh?id=478f396c78b15d811c0537347d739a5d67274008

When we attempt to cache the images we're looking for

https://images.rdoproject.org/newton/rdo_trunk/5086c67bdf613ed57527446288722a9a2f736168_e6129755/ironic-python-agent.tar

vs

https://images.rdoproject.org/newton/rdo_trunk/5086c67bdf613ed57527446288722a9a2f736168_e6129755/consistent/ironic-python-agent.tar

Logs:

https://thirdparty.logs.rdoproject.org/jenkins-rdo-newton-promote-rdo_trunk-build-images-116/console.txt.gz#_2018-02-27_15_09_44_661

[Matt Young (halcyondude)]

resolved by patch to internal rdo cache image script

https://code.e.r.c/gerrit/#/c/131790