[WIP] [18.06] Fix CLI external-ca tests in swarm suite

[cyli]

docker/cli#1178 changed the CLI behavior so that
the external CA correctly propagates the CA certificate along with the
external CA URL. Update the tests to reflect that.

Signed-off-by: cyli cyli@twistedmatrix.com
(cherry picked from commit c238517)

This is a back port of moby#37442

cc @andrewhsu

[andrewhsu]

Hmm...I see error from the tests:

FAIL: docker_cli_swarm_test.go:84: DockerSwarmSuite.TestSwarmInit

[dc2cf882ec14f] waiting for daemon to start
[dc2cf882ec14f] daemon started

docker_cli_swarm_test.go:117:
    c.Assert(spec.CAConfig.ExternalCAs[0].CACert, checker.Equals, sw.TLSInfo.TrustRoot)
... obtained string = ""
... expected string = "" +
...     "-----BEGIN CERTIFICATE-----\n" +
...     "MIIBajCCARCgAwIBAgIUGb8Na0HBWGOw/+hQjH20AHC8NgcwCgYIKoZIzj0EAwIw\n" +
...     "EzERMA8GA1UEAxMIc3dhcm0tY2EwHhcNMTgwNzEyMjAyNzAwWhcNMzgwNzA3MjAy\n" +
...     "NzAwWjATMREwDwYDVQQDEwhzd2FybS1jYTBZMBMGByqGSM49AgEGCCqGSM49AwEH\n" +
...     "A0IABCabZGYtkV1zAyl5YHTVyTeJK4JdfzsqcdbtVwFDOe0FqN7MgHmlHmRp/IsJ\n" +
...     "c5NK6qhLbnA5Hr9iitR9ZkLPq4CjQjBAMA4GA1UdDwEB/wQEAwIBBjAPBgNVHRMB\n" +
...     "Af8EBTADAQH/MB0GA1UdDgQWBBQP1e1uGZtUgVkLI/M8YT9F9+r3MTAKBggqhkjO\n" +
...     "PQQDAgNIADBFAiEAmXYYvy2YlHekfgt7Lo3U0xl9DAkH7Yan9zYY6mL+Y8YCIAtS\n" +
...     "z7A7p9IgHrXNmD3WnlqkF8hfDpSbI2afgem/Ddtm\n" +
...     "-----END CERTIFICATE-----\n"

FAIL: docker_cli_swarm_test.go:35: DockerSwarmSuite.TestSwarmUpdate

[d063c33440700] waiting for daemon to start
[d063c33440700] daemon started

docker_cli_swarm_test.go:68:
    c.Assert(spec.CAConfig.ExternalCAs[0].CACert, checker.Equals, sw.TLSInfo.TrustRoot)
... obtained string = ""
... expected string = "" +
...     "-----BEGIN CERTIFICATE-----\n" +
...     "MIIBajCCARCgAwIBAgIUTdl63bOeoO1viOSyQFYK8HkV7JcwCgYIKoZIzj0EAwIw\n" +
...     "EzERMA8GA1UEAxMIc3dhcm0tY2EwHhcNMTgwNzEyMjAzNDAwWhcNMzgwNzA3MjAz\n" +
...     "NDAwWjATMREwDwYDVQQDEwhzd2FybS1jYTBZMBMGByqGSM49AgEGCCqGSM49AwEH\n" +
...     "A0IABFooNPkxaV7MawuE2m8gDgpOhzznZvu2p2EO8sLxSgaomdzm2JiIbnFcHlx/\n" +
...     "x7Z+RCn4zNvctD6bSvn202epWRijQjBAMA4GA1UdDwEB/wQEAwIBBjAPBgNVHRMB\n" +
...     "Af8EBTADAQH/MB0GA1UdDgQWBBRZ1fkERZCE68mp3+xvwW3BoIJuETAKBggqhkjO\n" +
...     "PQQDAgNIADBFAiEA5hRD8I8DlbofWFAHpobtTYe5lKwDRVmV66FMLoaa17UCIBKP\n" +
...     "Itipqrlkcpjw/ICccqW0aGrsKTbEzKl3mlYnuFaz\n" +
...     "-----END CERTIFICATE-----\n"

[cyli]

This is because engine is specifying testing against 17.06-ce CLI, which did not have this behavior change, and there is currently no 18.06-ce CLI yet. :|. I believe, as per @thaJeztah, we have to move the tests elsewhere or re-write them to just use the API.