cleanup: go vet and golint run (#736)

* cleanup: go vet and golint run

Various cleanups trickered by go vet and golint.

* Fix tests and lowercase all errors

Lowercase all errors, some tests in kubernetes use errors from
kubernetes which do start with a capital letter.

1 files changed, 2 insertions, 2 deletions

diff --git a/middleware/file/notify.go b/middleware/file/notify.go
index 381c1e8c2..90dfdc521 100644
--- a/middleware/file/notify.go
+++ b/middleware/file/notify.go
@@ -71,7 +71,7 @@ func notifyAddr(c *dns.Client, m *dns.Msg, s string) (err error) {
 		}
 	}
 	if err != nil {
-		return fmt.Errorf("Notify for zone %q was not accepted by %q: %q", m.Question[0].Name, s, err)
+		return fmt.Errorf("notify for zone %q was not accepted by %q: %q", m.Question[0].Name, s, err)
 	}
-	return fmt.Errorf("Notify for zone %q was not accepted by %q: rcode was %q", m.Question[0].Name, s, rcode.ToString(code))
+	return fmt.Errorf("notify for zone %q was not accepted by %q: rcode was %q", m.Question[0].Name, s, rcode.ToString(code))
 }