Remove redundant import
Summary:
no need to import hostname
```error: this import is redundant
--> /data/users/phyllipe/fbsource/fbcode/common/rust/shed/slog_glog_fmt/src/kv_defaults.rs:13:1
|
13 | use hostname;
| ^^^^^^^^^^^^^ help: remove it entirely
|
```
//! Module defining FacebookKV structure that should be used by all Facebook services
use anyhow::Result;
-use hostname;
use slog::{Record, Result as SlogResult, Serializer, KV};
/// Structure containing all common KV values for Facebook services
