LU-7982 libcfs: memory allocation without CPT for binheap

LU-7982 libcfs: memory allocation without CPT for binheap

In order to use heap in cases which are not tied to a specific CPT,
memory allocation should support normal memory allocation. This
patch adds support for it.

Signed-off-by: Li Xi <lixi@ddn.com>
Change-Id: I1daeb76b708489b3adf09251fe1fbf2ddeab35aa
Reviewed-on: http://review.whamcloud.com/19317
Tested-by: Jenkins
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Nikitas Angelinas <nikitasangelinas@gmail.com>
Reviewed-by: Emoly Liu <emoly.liu@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>