Adjust the cross-chain logic from iris to etherum#7

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dreamer-zq wants to merge 7 commits intoiris-peggyfrom zzq/iris2etherum

+559-1,942

Commits on Dec 28, 2020

fee adjust
张志强
committed
adjust method signature
张志强
committed

Commits on Dec 29, 2020

Adjust the transfer logic from cosmos to eth
张志强
committed
fix relayer bug
张志强
committed
update log level
张志强
committed
fix error
张志强
committed

Commits on Dec 30, 2020

fix test error
张志强
committed