DAOS-19792 dlck: fix SIGSEGV in dlck_test_helper

[janekmi]

DTX module has to be registred before it is needed.

Skip-func-vm: true
Skip-fault-injection-test: true
Skip-test-el-9.6-rpms: true
Skip-test-leap-15-rpms: true
Skip-func-hw-test: true

Steps for the author:

• Commit message follows the guidelines.
• Appropriate Features or Test-tag pragmas were used.
• Appropriate Functional Test Stages were run.
• At least two positive code reviews including at least one code owner from each category referenced in the PR.
• Testing is complete. If necessary, forced-landing label added and a reason added in a comment.

After all prior steps are complete:

• Gatekeeper requested (daos-gatekeeper added as a reviewer).

[github-actions]

Ticket title is 'dlck: fix SIGSEGV in dlck_test_helper'
Status is 'In Progress'
https://daosio.atlassian.net/browse/DAOS-19792

[daosbuild3]

Test stage Functional on EL 9 completed with status UNSTABLE. https://jenkins-3.daos.hpc.amslabs.hpecorp.net/job/daos-stack/job/daos//view/change-requests/job/PR-19324/1/testReport/