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.

lib/kv/bolt.go

@@ -79,7 +79,7 @@ func Start(ctx context.Context, facility string, f fs.Fs) (*DB, error) {
 	}
 
 	name := makeName(facility, f)
-	lockTime := fs.GetConfig(ctx).KvLockTime
+	lockTime := time.Duration(fs.GetConfig(ctx).KvLockTime)
 
 	db := &DB{
 		name:      name,