Improve the way to hash genesis config

[zjshen14]

Based on protobuf instead of file checksum

[codecov]

Codecov Report

Merging #691 into master will decrease coverage by 0.21%.
The diff coverage is 3.77%.

@@            Coverage Diff             @@
##           master     #691      +/-   ##
==========================================
- Coverage   60.19%   59.97%   -0.22%     
==========================================
  Files         132      132              
  Lines       12588    12633      +45     
==========================================
  Hits         7577     7577              
- Misses       3963     4010      +47     
+ Partials     1048     1046       -2

Impacted Files	Coverage Δ
blockchain/genesis/genesis.go	42.58% <0%> (-19.24%)	⬇️
blockchain/blockchain.go	49.74% <100%> (ø)	⬆️
db/trie/branchnode.go	65.59% <0%> (-1.61%)	⬇️
consensus/scheme/rolldpos/rolldposctx.go	75.57% <0%> (+0.45%)	⬆️
db/trie/extensionnode.go	59.32% <0%> (+1.69%)	⬆️

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