Use the new v3 native translation jobs.
Remove all jobs for api-site, security-doc, openstack-manuals that are
in-repo now.
Move openstack-specs-jobs template to project-templates, it does not
include any legacy jobs.
Depends-On: I9f1f0421043bd8974f94c5f684126ad195c76c9e
Change-Id: I933be2cfb0d709f6feec36da179f103f1372a9a5