Have modified the testcases for RESTCONF inventory and uncommented the failed testcases that are filed before hydrogen release.

Change-Id: I46aeb0f99a7c6af2b2d0e6f59c8df48f1de07ea2
Signed-off-by: Madhusudhan <madhusudhan.opendaylight@yahoo.com>
(cherry picked from commit 0cc4dfa0305267109bd54b020e581da6b5a8b8fe)