[StreamTracker] allow rollback to start-1

[Besroy]

Related issue: eBay/HomeStore#857

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 50.44%. Comparing base (370c772) to head (1cc6a31).
⚠️ Report is 86 commits behind head on master.
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Additional details and impacted files

@@             Coverage Diff             @@
##           master     #294       +/-   ##
===========================================
- Coverage   64.29%   50.44%   -13.86%     
===========================================
  Files          72       63        -9     
  Lines        4406     4084      -322     
  Branches      555     1774     +1219     
===========================================
- Hits         2833     2060      -773     
+ Misses       1327      868      -459     
- Partials      246     1156      +910     

Components	Coverage Δ
AuthManager	55.55% <ø> (-22.23%)	⬇️
Cache	31.52% <54.12%> (+1.58%)	⬆️
FDS	60.57% <21.73%> (-10.55%)	⬇️
FileWatcher	37.60% <20.00%> (-18.65%)	⬇️
Flip	∅ <ø> (∅)
gRPC	56.59% <46.87%> (-20.46%)	⬇️
Logging	27.65% <22.72%> (-2.53%)	⬇️
Metrics	58.77% <63.82%> (-21.43%)	⬇️
Options	25.00% <ø> (-75.00%)	⬇️
Setting	29.62% <ø> (-27.17%)	⬇️
StatusObject	37.16% <ø> (-36.67%)	⬇️
Utility	60.98% <100.00%> (-21.74%)	⬇️
Version	36.00% <ø> (-59.84%)	⬇️

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[xiaoxichen]

lgtm