FAB-5478 cleanup deadcode from bddtests/regression

Delete all the files listed in bddtests/regression folder as it is
a deadcode and not using anywhere in the fabric repository. We have moved
similar files to test/feature folder.

Change-Id: Iceaa72377beaf8c93a26f1b54323296764573d9c
Signed-off-by: rameshthoomu <rameshbabu.thoomu@gmail.com>

Author: rameshthoomu