fstests: add GlusterFS support

Add basic GlusterFS support. Neither new GlusterFS specific tests
nor related patches are included. Only support FSTYP=glusterfs or
check -glusterfs XXX.

To test on glusterfs, two gluster volumes and two mountpoint
directories are needed.

Signed-off-by: Zorro Lang <zlang@redhat.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>
4 files changed