chore: Absent state file is not a warning (#315)

User is not expected to do anything when the auth cache file is absent
or cannot be opened. Because of that it makes no sense to log this as
warning.

Author: gtema

openstack_sdk/src/state.rs

@@ -23,7 +23,7 @@ use std::collections::HashMap;
 use std::fs::{DirBuilder, File};
 use std::io::prelude::*;
 use std::path::PathBuf;
-use tracing::{trace, warn};
+use tracing::{debug, info, trace, warn};
 
 use crate::auth::{
     authtoken::{AuthToken, AuthTokenScope},
@@ -244,7 +244,7 @@ impl State {
                             Some(auth)
                         }
                         Err(x) => {
-                            warn!(
+                            info!(
                                 "Corrupted cache file {}: {:?}. Removing ",
                                 fname.display(),
                                 x
@@ -254,13 +254,17 @@ impl State {
                         }
                     },
                     _ => {
-                        warn!("Error reading file {}", fname.display());
+                        // Not able to read file, maybe it is corrupted. There is nothing user can
+                        // or is expected to do about it, but it make sense to make user aware of.
+                        info!("Error reading file {}", fname.display());
                         None
                     }
                 }
             }
             _ => {
-                warn!("Error opening file {}", fname.display());
+                // Not able to open file, maybe it is missing. There is nothing user can or is
+                // expected to do about it.
+                debug!("Error opening file {}", fname.display());
                 None
             }
         }