Fix some tests

tests/kernel_headers_test.go

@@ -0,0 +1,12 @@
+package integration
+
+import . "gopkg.in/check.v1"
+
+func (s *QemuSuite) TestKernelHeaders(c *C) {
+	err := s.RunQemu("--cloud-config", "./tests/assets/test_22/cloud-config.yml")
+	c.Assert(err, IsNil)
+
+	s.CheckCall(c, `
+sleep 10
+docker inspect kernel-headers`)
+}