Added repo link for xfsprogs.
Package not included in the standard RHEL6/epel6 distribution.
Revert "Added repo link for xfsprogs."
Although this change worked, it included other packages in the build cache which are not needed.
There's a better way to do it - be more selective and use raw_pkgs instead.
This reverts commit 2d3c53269d53100798b9eaafa54b50a85865fb3b.
load xfsprogs using raw_pkgs
move raw_pkgs under the OS tag