features/snapview-server: verify the fs instance in revalidated lookups as well

Change-Id: Id5f9d5a23eb5932a0a53520b08ffba258952e000
BUG: 1151004
Signed-off-by: Raghavendra Bhat <raghavendra@redhat.com>
Reviewed-on: http://review.gluster.org/8999
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>