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/server/upid.rs

@@ -1,7 +1,6 @@
 use std::sync::atomic::{AtomicUsize, Ordering};
 
 use anyhow::{bail, Error};
-use chrono::Local;
 
 use proxmox::api::schema::{ApiStringFormat, Schema, StringSchema};
 use proxmox::const_regex;
@@ -89,7 +88,7 @@ impl UPID {
         Ok(UPID {
             pid,
             pstart: procfs::PidStat::read_from_pid(nix::unistd::Pid::from_raw(pid))?.starttime,
-            starttime: Local::now().timestamp(),
+            starttime: proxmox::tools::time::epoch_i64(),
             task_id,
             worker_type: worker_type.to_owned(),
             worker_id,