rename binaries for clarity, and first pass of connect_to_servers test util

backend/test_utils/Cargo.toml

@@ -7,6 +7,7 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+anyhow = "1.0.41"
 futures = "0.3.15"
 http = "0.2.4"
 log = "0.4.14"