Merge pull request #1805 from Kimbsen/master

Fix panic on macos when passing a certificate as []byte to iris.TLS()

core/host/supervisor.go

@@ -517,7 +517,7 @@ func (su *Supervisor) shutdownOnInterrupt(ctx context.Context) {
 // fileExists tries to report whether a local physical file of "filename" exists.
 func fileExists(filename string) bool {
 	info, err := os.Stat(filename)
-	if os.IsNotExist(err) {
+	if err != nil {
 		return false
 	}