LU-5120 Don't really need the default-base rpm

The kernel-default-base is not actually needed to build Lustre
on SLES11 so get rid of it.
Clean up the fetching of needed packages.

Signed-off-by: Brian J. Murrell <brian.murrell@intel.com>
Change-Id: Ieee2b01f9a8c280de5d2cc4c43ff672539eea7ef
Reviewed-on: http://review.whamcloud.com/10485
Tested-by: Jenkins
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Minh Diep <minh.diep@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>