BasitMehmood

Results 4 issues of BasitMehmood

This commit contains vseq and other realted files and verify the functioanlity of program buffer.

This commit add up the request_halt() task in base_vseq for reusability of this task in other vseqs.

This PR contain 3 additional testplan entries. It takes time to review,make changes and merge vseqs so i did separate PR for testplan only so that tesplan can merge early.

This is one of new test sequences that present to OT team. It covers both paths as suggested(DM+dm_mem).