fix(common/countdown,params): correct the exponential timeout arithmetic and validate its bounds - #2836

fix(common/countdown,params): correct the exponential timeout arithmetic and validate its bounds#2836

gzliudan merged 3 commits into

XinFinOrg:dev-upgradeXinFinOrg/XDPoSChain:dev-upgradefrom

gzliudan:fix-countdown-round-diff-truncationgzliudan/XDPoSChain:fix-countdown-round-diff-truncationCopy head branch name to clipboard