polly: remove crate and code

Signed-off-by: Adrian Catangiu <[email protected]>

Author: acatangiu

Cargo.lock

@@ -16,7 +16,6 @@ dumbo = { path = "../dumbo" }
 logger = { path = "../logger" }
 mmds = { path = "../mmds" }
 net_gen = { path = "../net_gen" }
-polly = { path = "../polly" }
 rate_limiter = { path = "../rate_limiter" }
 serde = { version = ">=1.0.27", features = ["derive"] }
 snapshot = { path = "../snapshot" }