Fix and clarify redirect HTTP logic

redirect-http seemed to suggest the Pages daemon would redirect from HTTPS to HTTP, but it seems that the opposite was implied.

Fixes issue manifested by https://gitlab.com/gitlab-org/omnibus-gitlab/merge_requests/1348

acceptance_test.go

@@ -77,6 +77,7 @@ func TestHttpRedirect(t *testing.T) {
 	if assert.NoError(t, err) {
 		defer rsp.Body.Close()
 		assert.Equal(t, http.StatusTemporaryRedirect, rsp.StatusCode)
+		assert.Equal(t, []string{"https://127.0.0.1:37001/project/"}, rsp.Header["Location"])
 	}
 }