qa: set runoncfuse.sh to run cfuse in background and kill at end of tests.
qa: set runoncfuse.sh to run cfuse in background and kill at end of tests.

This is an imperfect solution at best, since it doesn't handle errors at all,
but it'll have to do for now.

ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph