Hotfix/trace result set

[ithinker1991]

What does this PR do?
set contract result
Why are these changes required?
set contract result

This PR has been tested by:

• Unit Tests
• Manual Testing

Follow up

Extra details

[codecov-io]

Codecov Report

Merging #2312 into master will decrease coverage by 0.02%.
The diff coverage is 0%.

@@             Coverage Diff              @@
##             master    #2312      +/-   ##
============================================
- Coverage     42.51%   42.49%   -0.03%     
- Complexity     4338     4344       +6     
============================================
  Files           537      537              
  Lines         32483    32522      +39     
  Branches       3562     3576      +14     
============================================
+ Hits          13809    13819      +10     
- Misses        17348    17381      +33     
+ Partials       1326     1322       -4

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/org/tron/core/db/Manager.java	44.06% <0%> (ø)	116 <0> (ø)	⬇️
...java/org/tron/core/capsule/TransactionCapsule.java	15.89% <0%> (-1.28%)	20 <0> (ø)
...org/tron/core/actuator/ProposalCreateActuator.java	39.28% <0%> (-0.57%)	23 <0> (ø)
src/main/java/org/tron/core/Wallet.java	11.12% <0%> (ø)	34 <0> (ø)	⬇️
...tron/common/overlay/discover/node/NodeManager.java	52.2% <0%> (+0.62%)	25% <0%> (+2%)	⬆️
src/main/java/org/tron/common/utils/ByteArray.java	56.66% <0%> (+3.33%)	16% <0%> (+1%)	⬆️
...g/tron/common/overlay/discover/DiscoverServer.java	82.75% <0%> (+8.62%)	8% <0%> (+2%)	⬆️
...rg/tron/common/net/udp/handler/MessageHandler.java	100% <0%> (+10.34%)	8% <0%> (+1%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update bae21f6...81111b2. Read the comment docs.

[BlueHoopor]

continuous-integration/travis-ci/pr failed.
but, QA told me, I should merge this pr, then they can fix this travis problem.