Extract IBC queries paths into conditional modules (informalsystems#24)

* Extract IBC queries paths into conditional modules

Since these paths currently differ between the Go implementation
and the ICS, we need to be able to switch them up at compile-time
for when we will need to test against the Go implementation.

* Revert tendermint dependency to master

relayer/relay/Cargo.toml

@@ -11,7 +11,7 @@ authors = [
 
 [dependencies]
 relayer-modules = { path = "../../modules" }
-tendermint = { git = "https://github.com/romac/tendermint-rs.git", branch = "rpc-client-new-sync" }
+tendermint = { git = "https://github.com/interchainio/tendermint-rs.git" }
 
 anomaly = "0.2.0"
 humantime-serde = "1.0.0"