consensus: delete the RegisterKernMethod panic in registry_imp & allo…

[aucusaga]

Delete the RegisterKernMethod panic in registry_imp & allow consensus upgrade with the same name & add CheckConsensusVersion. Configuration should only store a version parameter when rolling back and should have an upper version parameter with other configs when updating a new consensus item.

[CLAassistant]

All committers have signed the CLA.

[codecov-commenter]

Codecov Report

Merging #278 (2f00ca8) into master (1bdfc06) will decrease coverage by 0.15%. The diff coverage is 34.24%.

@@            Coverage Diff             @@
##           master     #278      +/-   ##
==========================================
- Coverage   46.61%   46.45%   -0.16%     
==========================================
  Files         136      136              
  Lines       12108    12143      +35     
==========================================
- Hits         5644     5641       -3     
- Misses       5297     5337      +40     
+ Partials     1167     1165       -2     

Impacted Files	Coverage Δ
bcs/consensus/xpoa/common.go	85.71% <ø> (ø)
kernel/contract/manager/registry_impl.go	53.33% <0.00%> (-5.21%)	:arrow_down:
kernel/consensus/pluggable_consensus.go	40.66% <30.90%> (-1.08%)	:arrow_down:
bcs/consensus/xpoa/schedule.go	47.82% <40.00%> (-0.83%)	:arrow_down:
bcs/consensus/xpoa/xpoa.go	55.26% <57.14%> (-0.66%)	:arrow_down:
bcs/consensus/tdpos/tdpos.go	50.24% <100.00%> (+0.96%)	:arrow_up:
bcs/consensus/tdpos/common.go	57.81% <0.00%> (-9.38%)	:arrow_down:
bcs/consensus/tdpos/schedule.go	42.66% <0.00%> (-5.05%)	:arrow_down:
kernel/consensus/base/driver/chained-bft/smr.go	42.13% <0.00%> (-0.80%)	:arrow_down:
... and 1 more

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