Quorum: Ensure we maintain majority in threshold calculations

[codecov[bot]]

Codecov Report

Merging #3192 (e41c81e) into v0.x.x (f5b71e0) will increase coverage by 0.03%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           v0.x.x    #3192      +/-   ##
==========================================
+ Coverage   79.07%   79.11%   +0.03%     
==========================================
  Files         209      209              
  Lines       18929    18940      +11     
==========================================
+ Hits        14968    14984      +16     
+ Misses       3961     3956       -5     

Flag	Coverage Δ
integration	20.27% <ø> (+0.50%)	:arrow_up:
unittests	87.29% <100.00%> (-0.06%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
source/agora/consensus/Quorum.d	97.09% <100.00%> (+0.01%)	:arrow_up:
source/agora/consensus/data/Params.d	47.05% <100.00%> (+3.30%)	:arrow_up:
source/scpd/scp/SCPDriver.d	60.00% <0.00%> (-15.00%)	:arrow_down:
source/agora/network/Client.d	82.44% <0.00%> (-4.59%)	:arrow_down:
source/agora/network/Manager.d	78.96% <0.00%> (-1.30%)	:arrow_down:
source/agora/script/Engine.d	97.59% <0.00%> (-0.16%)	:arrow_down:
source/agora/consensus/protocol/Nominator.d	91.80% <0.00%> (+0.14%)	:arrow_up:
source/agora/flash/Node.d	80.88% <0.00%> (+0.21%)	:arrow_up:
source/agora/node/Validator.d	91.19% <0.00%> (+0.42%)	:arrow_up:
source/agora/utils/Log.d	58.94% <0.00%> (+10.59%)	:arrow_up:

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