[Tachyon-26] test UnderFileSystem.get() code path in Glusterfs Cluster.

Fix the dependency issue in gluster test profile;
Update gluster test instruction in glusterfs setup document.

Signed-off-by: rootfs <hchen@redhat.com>
There are two glusterfs related profiles. This PR consolidates them into single one.

This profile uses GlusterfsCluster as ufs, so it is not really local.