switch from failure to anyhow

Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>

src/api2/backup/environment.rs

@@ -1,4 +1,4 @@
-use failure::*;
+use anyhow::{bail, Error};
 use std::sync::{Arc, Mutex};
 use std::collections::HashMap;
 

src/api2/backup/upload_chunk.rs

@@ -2,7 +2,7 @@ use std::pin::Pin;
 use std::sync::Arc;
 use std::task::{Context, Poll};
 
-use failure::*;
+use anyhow::{bail, format_err, Error};
 use futures::*;
 use hyper::Body;
 use hyper::http::request::Parts;