* from the patch which got tested in experimental branch, there
  was a code cleanup involved, which missed setting of a local
  variable, which led to crash immediately after enabling the
  feature.
* added a sanity test case to validate all the fops of sdfs.

Updates: #397

Change-Id: I7e0bebfc195c344620577cb16c1afc5f4e7d2d92
Signed-off-by: Amar Tumballi <amarts@redhat.com>