make MinGasPrice consensus param

[johannbarbie]

related to leapdao/leap-contracts#116
resolves #100

[codecov]

Codecov Report

Merging #163 into master will decrease coverage by 0.34%.
The diff coverage is 92.85%.

@@            Coverage Diff            @@
##           master    #163      +/-   ##
=========================================
- Coverage   94.15%   93.8%   -0.35%     
=========================================
  Files          54      55       +1     
  Lines         633     646      +13     
  Branches      114     116       +2     
=========================================
+ Hits          596     606      +10     
- Misses         33      36       +3     
  Partials        4       4

Impacted Files	Coverage Δ
src/abis/exitHandler.js	100% <ø> (ø)	⬆️
src/tx/applyTx/checkMinGasPrice.js	100% <100%> (ø)
src/tx/applyTx/utils.js	98.38% <100%> (-1.62%)	⬇️
src/bridgeState.js	75% <50%> (-0.81%)	⬇️
src/tx/applyTx/checkDeposit.js	93.75% <0%> (-6.25%)	⬇️

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[sunify]

Looks good for me 👌