[CSL-928] Make UnsignedVarInt decode fail for non-normalized varints
[CSL-928] Make UnsignedVarInt decode fail for non-normalized varints

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