Problem (Fix #1095): Reward distribution don't increase staking account's nonce

[yihuang]

Solution:

• Increase nonce by one when add reward.

[tomtau]

unit test fails -- I think it on L203 you can increase the nonce that the transaction is created with.
also, it can be good to add a unit test that only captures this bug (e.g. do a reward distribution and check that nonces of affected accounts were updated)

[yihuang]

unit test fails -- I think it on L203 you can increase the nonce that the transaction is created with.
also, it can be good to add a unit test that only captures this bug (e.g. do a reward distribution and check that nonces of affected accounts were updated)

Done, add checking of nonce in the standard reward distribution test case.

[codecov]

Codecov Report

Merging #1100 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1100      +/-   ##
==========================================
- Coverage   66.24%   66.24%   -0.01%     
==========================================
  Files         145      145              
  Lines       18840    18843       +3     
==========================================
+ Hits        12481    12482       +1     
- Misses       6359     6361       +2

Impacted Files	Coverage Δ
chain-abci/tests/validator_changes.rs	100% <100%> (ø)	⬆️
chain-core/src/state/account.rs	76.67% <100%> (+0.06%)	⬆️
chain-abci/src/app/rewards.rs	98.37% <100%> (+0.02%)	⬆️
chain-core/src/tx/fee/mod.rs	87% <0%> (-0.5%)	⬇️
chain-core/src/common/merkle_tree.rs	98.55% <0%> (-0.25%)	⬇️

[tomtau]

bors r+

[bors]

Build succeeded

• continuous-integration/travis-ci/push
• drone-hw/push