LU-2473 ldiskfs: Add ldiskfs support for RHEL 6.4

LU-2473 ldiskfs: Add ldiskfs support for RHEL 6.4

Add an ldiskfs kernel patch series to support the RHEL 6.4 kernel.

The ldiskfs series selection macro (LB_LDISKFS_SERIES) is fixed up
to use the AS_VERSION_COMPARE, which allows us to check if the kernel
version is greater than or equal to a specific number, rather than
just a simple pattern match.

Change-Id: I894ace2d98e3d5c7481230794e9edf984bce7aee
Signed-off-by: Christopher J. Morrone <morrone2@llnl.gov>
Reviewed-on: http://review.whamcloud.com/4804
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: James Simmons <uja.ornl@gmail.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>