Plumb deal.PublishCid in HandoffDeal

[magik6k]

Need this in filecoin-project/lotus#3350

[codecov-commenter]

Codecov Report

Merging #383 into master will decrease coverage by 0.01%.
The diff coverage is 20.00%.

@@            Coverage Diff             @@
##           master     #383      +/-   ##
==========================================
- Coverage   61.36%   61.36%   -0.00%     
==========================================
  Files          43       43              
  Lines        2875     2880       +5     
==========================================
+ Hits         1764     1767       +3     
- Misses        960      962       +2     
  Partials      151      151              

Impacted Files	Coverage Δ
retrievalmarket/impl/clientstates/client_fsm.go	73.53% <0.00%> (-3.00%)	⬇️
...oragemarket/impl/providerstates/provider_states.go	84.72% <100.00%> (+0.07%)	⬆️
retrievalmarket/impl/provider_environments.go	71.43% <0.00%> (+2.39%)	⬆️

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