[CSL-677] Remove key from DataMsg, Util.Relay only
[CSL-677] Remove key from DataMsg, Util.Relay only

input-output-hk/cardano-sl,input-output-hk/pos-haskell-prototype,input-output-hk/cardano-sl,input-output-hk/pos-haskell-prototype,input-output-hk/cardano-sl,input-output-hk/pos-haskell-prototype,input-output-hk/cardano-sl