avoid chrono dependency, depend on proxmox 0.3.8

- remove chrono dependency

- depend on proxmox 0.3.8

- remove epoch_now, epoch_now_u64 and epoch_now_f64

- remove tm_editor (moved to proxmox crate)

- use new helpers from proxmox 0.3.8
  * epoch_i64 and epoch_f64
  * parse_rfc3339
  * epoch_to_rfc3339_utc
  * strftime_local

- BackupDir changes:
  * store epoch and rfc3339 string instead of DateTime
  * backup_time_to_string now return a Result
  * remove unnecessary TryFrom<(BackupGroup, i64)> for BackupDir

- DynamicIndexHeader: change ctime to i64

- FixedIndexHeader: change ctime to i64

src/tools/file_logger.rs

@@ -1,5 +1,4 @@
 use anyhow::{Error};
-use chrono::Local;
 use std::io::Write;
 
 /// Log messages with timestamps into files
@@ -56,7 +55,10 @@ impl FileLogger {
             stdout.write_all(b"\n").unwrap();
         }
 
-        let line = format!("{}: {}\n", Local::now().to_rfc3339(), msg);
+        let now = proxmox::tools::time::epoch_i64();
+        let rfc3339 = proxmox::tools::time::epoch_to_rfc3339(now).unwrap();
+
+        let line = format!("{}: {}\n", rfc3339, msg);
         self.file.write_all(line.as_bytes()).unwrap();
     }
 }