switch from failure to anyhow

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

src/api2/reader/environment.rs

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