Remove code only used for RHEL 6.3
Remove code only used for RHEL 6.3

Because there are no more EPEL6 repositories on
https://repos.fedorapeople.org/repos/openstack/openstack-juno/
this code can be removed.

Change-Id: Ic8daa0962ad7336f5b9a07c4e44560c860301cc5

stackforge/packstack,xbezdick/packstack,fr34k8/packstack,imcsk8/packstack,fr34k8/packstack,xbezdick/packstack,imcsk8/packstack,palmer159/openstack-test,palmer159/openstack-test,palmer159/openstack-test,fr34k8/packstack,stackforge/packstack,openstack/packstack,openstack/packstack,xbezdick/packstack,stackforge/packstack,imcsk8/packstack,mahak/packstack,openstack/packstack,mahak/packstack,mahak/packstack