Fire storage deal provider ready event after startup completes

[dirkmc]

Ensure that the "ready" event is only fired after the start() method returns

[codecov-commenter]

Codecov Report

❌ Patch coverage is 37.50000% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.67%. Comparing base (70dbd2f) to head (a9652b0).
⚠️ Report is 67 commits behind head on master.

Files with missing lines	Patch %	Lines
storagemarket/impl/provider.go	37.50%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #708      +/-   ##
==========================================
+ Coverage   58.60%   58.67%   +0.08%     
==========================================
  Files          64       64              
  Lines        5362     5398      +36     
==========================================
+ Hits         3142     3167      +25     
- Misses       1882     1886       +4     
- Partials      338      345       +7     

Files with missing lines	Coverage Δ
storagemarket/impl/provider.go	26.63% <37.50%> (+3.74%)	⬆️

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