Make sure that mmap'ed files smaller than a page size are written to.
Make sure that mmap'ed files smaller than a page size are written to.

This is a test to make sure that there is actually enough memory
to back the requested shared memory.

Signed-off-by: Angus Salkeld <86b65304d27d8de73dd7d624c33df7e088f8d94b@redhat.com>

gao-yan/libqb,ClusterLabs/libqb,gao-yan/libqb,ClusterLabs/libqb,rubenk/libqb,ClusterLabs/libqb,davidvossel/libqb,kgaillot/libqb,rubenk/libqb,kgaillot/libqb,davidvossel/libqb,kgaillot/libqb