Tests are failing for the x-pack/packetbeat help enroll

[v1v]

What

The test assertion for packetbeat help enroll doesn't contain 'Unknown help topic' is failing

This assertion was introduced a couple of years ago, see #105

Version

It uses the latest 8.0-SNAPSHOT version stored in gs://beats-ci-artifacts/snapshots/packetbeat

Log

[2021-06-15T08:54:22.828Z] TASK [test-beat : Get packetbeat help output for an X-Pack feature] ************
[2021-06-15T08:54:23.526Z] changed: [tester-awslinux]
[2021-06-15T08:54:23.526Z] changed: [tester-centos7-64]
[2021-06-15T08:54:23.526Z] changed: [tester-awslinux2]
[2021-06-15T08:54:23.526Z] changed: [tester-centos8-64]
[2021-06-15T08:54:23.526Z] 
[2021-06-15T08:54:23.526Z] TASK [test-beat : Check that packetbeat contains X-Pack features] **************
[2021-06-15T08:54:23.526Z] fatal: [tester-awslinux]: FAILED! => {
[2021-06-15T08:54:23.526Z]     "assertion": "'Unknown help topic' not in xpack_cmd_result.stderr", 
[2021-06-15T08:54:23.526Z]     "changed": false, 
[2021-06-15T08:54:23.526Z]     "evaluated_to": false, 
[2021-06-15T08:54:23.526Z]     "msg": "Assertion failed"
[2021-06-15T08:54:23.526Z] }
[2021-06-15T08:54:23.526Z] fatal: [tester-awslinux2]: FAILED! => {
[2021-06-15T08:54:23.526Z]     "assertion": "'Unknown help topic' not in xpack_cmd_result.stderr", 
[2021-06-15T08:54:23.526Z]     "changed": false, 
[2021-06-15T08:54:23.526Z]     "evaluated_to": false, 
[2021-06-15T08:54:23.526Z]     "msg": "Assertion failed"
[2021-06-15T08:54:23.526Z] }
[2021-06-15T08:54:23.526Z] fatal: [tester-centos7-64]: FAILED! => {
[2021-06-15T08:54:23.526Z]     "assertion": "'Unknown help topic' not in xpack_cmd_result.stderr", 
[2021-06-15T08:54:23.526Z]     "changed": false, 
[2021-06-15T08:54:23.526Z]     "evaluated_to": false, 
[2021-06-15T08:54:23.526Z]     "msg": "Assertion failed"
[2021-06-15T08:54:23.526Z] }
[2021-06-15T08:54:23.526Z] fatal: [tester-centos8-64]: FAILED! => {
[2021-06-15T08:54:23.526Z]     "assertion": "'Unknown help topic' not in xpack_cmd_result.stderr", 
[2021-06-15T08:54:23.526Z]     "changed": false, 
[2021-06-15T08:54:23.526Z]     "evaluated_to": false, 
[2021-06-15T08:54:23.526Z]     "msg": "Assertion failed"
[2021-06-15T08:54:23.526Z] }

You can see the whole log output in -> https://beats-ci.elastic.co/blue/rest/organizations/jenkins/pipelines/Beats/pipelines/beats-tester-mbp/pipelines/PR-193/runs/1/nodes/93/steps/133/log/?start=0

How to reproduce it

$ GROUP=centos make run-group

[adriansr]

This is caused by elastic/beats#25696, which removed the enroll subcommand.

We can revert #105, as I don't think the check makes sense now.