This used to be mirrored, however there were issues when upstream
dropped the PC1 repositories a few months back. The puppet openstack
jobs are still trying to leverage this mirror but it does not exist in
some regions because it was disabled on the afs content. This change
fixes the reprepo configuration to still pull down puppet5/6 for xenial
and strech and add the symlink back to the mirrors.
Change-Id: I71ad5afe086a503d75a365543ad8869e35ef873b
2f96a248c8