config: make parsing of duration options consistent

All user visible Durations should be fs.Duration rather than time.Duration. Suffix is then optional and defaults to s. Additional suffices d, w, M and y are supported, in addition to ms, s, m and h - which are the only ones supported by time.Duration. Absolute times can also be specified, and will be interpreted as duration relative to now.

cmd/cmd.go

@@ -288,7 +288,7 @@ func Run(Retry bool, showStats bool, cmd *cobra.Command, f func() error) {
 			accounting.GlobalStats().ResetErrors()
 		}
 		if ci.RetriesInterval > 0 {
-			time.Sleep(ci.RetriesInterval)
+			time.Sleep(time.Duration(ci.RetriesInterval))
 		}
 	}
 	stopStats()