caps: Modify numa functions to public

Modify numa related functions in caps module to be public since they
are called in other modules.

Change-Id: I7f23f294ea5759473acc33fb00dd20eadf5708a5
Signed-off-by: Bruce Shi <xiao-lei.shi@hp.com>
Reviewed-on: http://gerrit.ovirt.org/27515
Reviewed-by: Francesco Romani <fromani@redhat.com>
Reviewed-by: Dan Kenigsberg <danken@redhat.com>