Do r-3 block finalization

[peterlimg]

Fixes

Changes

• Change to finalize block when there at least 2 confirmats, i.e r-3.

Need to be mentioned in CHANGELOG.md?

Tests

Tasks to complete before merging PR:

• Ensure system tests are passing. If not Run them manually to check for any regressions 📋
• Do any new system tests need added to test this change? do any existing system tests need updated? If so create a PR at 0chain/system_test
• Merge your system tests PR to master AFTER merging this PR

Associated PRs (Link as appropriate):

• blobber:
• gosdk:
• system_test:
• zboxcli:
• zwalletcli:
• Other: ...

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 28.77%. Comparing base (cedc29e) to head (64f92ef).
Report is 40 commits behind head on sprint-1.14.

Files	Patch %	Lines
...de/go/0chain.net/chaincore/chain/protocol_round.go	0.00%	6 Missing ⚠️

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@               Coverage Diff               @@
##           sprint-1.14    #3205      +/-   ##
===============================================
- Coverage        28.79%   28.77%   -0.02%     
===============================================
  Files              405      405              
  Lines            67100    67165      +65     
===============================================
+ Hits             19322    19330       +8     
- Misses           45443    45494      +51     
- Partials          2335     2341       +6     

Flag	Coverage Δ
Unit-Tests	28.77% <0.00%> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.