There is a substantive difference between a content tarball and a source
tarball that was getting missed. Update the docs to indicate what a
'content' tarball is, and then update the
publish-openstack-javascript-content job to use the
fetch-javascript-content-tarball role.
Change-Id: I055ed8248f8243926601c0445ab7c911054fdeb0
Depends-On: https://review.openstack.org/550223
0a9e4e59ee