Update links to refereshed zfs-release packages

As described in https://github.com/zfsonlinux/zfs/issues/1686 the
zfs-release packages for epel and fedora have been updated to use
priorities.  This ensures we always pull the dkms version from the
ZoL repository.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>