Updates some integration tests to fix userns builds

- `TestRunMountReadOnlyDevShm` and `TestRunHostnameInHostMode` needs
  `NotUserNamespace` requirement as these are known limitation of
  userns.
- `TestBuildWorkdirCmd` should use a preload image (`busybox`) instead
  of one that require network access.

Signed-off-by: Vincent Demeester <vincent@sbr.pm>
Upstream-commit: bc19388fb239b1aa761d323405a7d6a6362845f4
Component: engine

components/engine/integration-cli/docker_cli_build_test.go

@@ -7386,12 +7386,12 @@ LABEL a=b
 	c.Assert(strings.TrimSpace(out), checker.Equals, `["sh"]`)
 }
 
-// Test case for 28902/28090
+// Test case for 28902/28909
 func (s *DockerSuite) TestBuildWorkdirCmd(c *check.C) {
 	testRequires(c, DaemonIsLinux)
 
 	dockerFile := `
-                FROM golang:1.7-alpine
+                FROM busybox
                 WORKDIR /
                 `
 	_, err := buildImage("testbuildworkdircmd", dockerFile, false)

components/engine/integration-cli/docker_cli_run_test.go

@@ -4635,7 +4635,7 @@ func (s *delayedReader) Read([]byte) (int, error) {
 
 // #28823 (originally #28639)
 func (s *DockerSuite) TestRunMountReadOnlyDevShm(c *check.C) {
-	testRequires(c, SameHostDaemon, DaemonIsLinux)
+	testRequires(c, SameHostDaemon, DaemonIsLinux, NotUserNamespace)
 	emptyDir, err := ioutil.TempDir("", "test-read-only-dev-shm")
 	c.Assert(err, check.IsNil)
 	defer os.RemoveAll(emptyDir)
@@ -4648,7 +4648,7 @@ func (s *DockerSuite) TestRunMountReadOnlyDevShm(c *check.C) {
 
 // Test case for 29129
 func (s *DockerSuite) TestRunHostnameInHostMode(c *check.C) {
-	testRequires(c, DaemonIsLinux)
+	testRequires(c, DaemonIsLinux, NotUserNamespace)
 
 	expectedOutput := "foobar\nfoobar"
 	out, _ := dockerCmd(c, "run", "--net=host", "--hostname=foobar", "busybox", "sh", "-c", `echo $HOSTNAME && hostname`)