also print verify_output on failure

[boddumanohar]

Changes

When the transaction failed, also print the transaction failure reason

Fixes

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):

• 0chain:
• gosdk:
• system_test:
• zboxcli:
• zwalletcli:
• Other: ...

[codecov-commenter]

Codecov Report

Merging #832 (d1e986c) into staging (99cfa96) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           staging     #832   +/-   ##
========================================
  Coverage    24.28%   24.28%           
========================================
  Files           80       80           
  Lines         8095     8095           
========================================
  Hits          1966     1966           
  Misses        5854     5854           
  Partials       275      275           

Flag	Coverage Δ
Unit-Tests	24.28% <ø> (ø)

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[cnlangzi]

LGTM