Adapt tests to new client contract version

[shrenujbansal]

Deal Proposal

• make deal proposal
• try make deal proposal, see if data structure is added
• confirm wrong cid not in data

Message Authentication

• authenticate message
• see if deals are rejected if:
• never made deal
• deal already taken

Mock Market

• uses Mock Market tests

Built in

• handle_filecoin_method -- call from built in actor?