integ-cli: skip tests launching registry-v2

Some pull/push tests are launching `registry-v2`
binary which is compiled and installed if the tests
are running in-container through `make test-integration-cli`.

However, registry is not supported to run on non-linux
platforms and we can't really spin up any registry-v2
containers in the remote DOCKER_TEST_HOST at this point.

Just skipping those with the new TestRequirement called
`RegistryHosting`.

Signed-off-by: Ahmet Alp Balkan <ahmetalpbalkan@gmail.com>

integration-cli/docker_utils.go

@@ -901,6 +901,7 @@ func readContainerFileWithExec(containerId, filename string) ([]byte, error) {
 }
 
 func setupRegistry(t *testing.T) func() {
+	testRequires(t, RegistryHosting)
 	reg, err := newTestRegistryV2(t)
 	if err != nil {
 		t.Fatal(err)