Merge pull request #2113 from zhencliu/gluster_hotplug

Support block hotplug for gluster storage backend

qemu/tests/cfg/remote_block_hotplug.cfg

 # Network storage backends:
 #   iscsi_direct
 #   ceph
+#   gluster_direct
 # The following testing scenarios are covered:
 #   hotplug/hotunplug a remote virtio-scsi image
 #   hotplug/hotunplug a remote virtio-blk image
 
 - block_hotplug_with_remote_storage: install setup image_copy unattended_install.cdrom
     no RHEL.3.9
-    only iscsi_direct ceph
+    only iscsi_direct ceph gluster_direct
     virt_test_type = qemu
     type = block_hotplug
     bootindex_image1 = 0