rpc/tendermint: fix TestBlockchainInfo as block metadata has restructured on tendermint 0.8
rpc/tendermint: fix TestBlockchainInfo as block metadata has restructured on tendermint 0.8

benjaminbollen/eris-db,benjaminbollen/burrow,silasdavis/burrow,silasdavis/burrow,eris-ltd/eris-db,benjaminbollen/burrow,eris-ltd/eris-db,silasdavis/burrow,benjaminbollen/eris-db