plugin/file: shutdown reload goroutine (#1571)

* plugin/file: shutdown reload goroutine

Shutdown the z.Reload() routine (if started in the first place) on
shutdow and reload.

Fixes #1508

* Must be put in c.OnShutdown()

* up test coverage

1 files changed, 9 insertions, 0 deletions

diff --git a/plugin/file/shutdown.go b/plugin/file/shutdown.go
new file mode 100644
index 000000000..cecd76e9e
--- /dev/null
+++ b/plugin/file/shutdown.go
@@ -0,0 +1,9 @@
+package file
+
+// OnShutdown shuts down any running go-routines for this zone.
+func (z *Zone) OnShutdown() error {
+	if !z.NoReload {
+		z.reloadShutdown <- true
+	}
+	return nil
+}