DAOS-16072 test: Support non-root user client commands

[phender]

Support running commands on client hosts w/o sudo permissions.

Skip-unit-tests: true
Skip-fault-injection-test: true
Skip-func-hw-test: true
Test-tag: test_launch_failures test_setup_vm test_core_files CartSelfTest DestroyTests

Required-githooks: true

Before requesting gatekeeper:

• Two review approvals and any prior change requests have been resolved.
• Testing is complete and all tests passed or there is a reason documented in the PR why it should be force landed and forced-landing tag is set.
• Features: (or Test-tag*) commit pragma was used or there is a reason documented that there are no appropriate tags for this PR.
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• Any tests skipped by the ticket being addressed have been run and passed in the PR.

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• Sufficient testing is done. Check feature pragmas and test tags and that tests skipped for the ticket are run and now pass with the changes.
• If applicable, the PR has addressed any potential version compatibility issues.
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[github-actions]

Ticket title is 'ftest: support starting daos_agent with systemctl --user'
Status is 'Open'
https://daosio.atlassian.net/browse/DAOS-16072

[daosbuild1]

Test stage Functional on EL 8.8 completed with status FAILURE. https://build.hpdd.intel.com//job/daos-stack/job/daos/view/change-requests/job/PR-14661/1/execution/node/798/log

[daosbuild1]

Test stage Functional on EL 8.8 completed with status FAILURE. https://build.hpdd.intel.com//job/daos-stack/job/daos/view/change-requests/job/PR-14661/2/execution/node/798/log

[daosbuild1]

Test stage Functional on EL 8.8 completed with status FAILURE. https://build.hpdd.intel.com//job/daos-stack/job/daos/view/change-requests/job/PR-14661/3/execution/node/798/log

[daosbuild1]

Test stage Functional on EL 8.8 completed with status FAILURE. https://build.hpdd.intel.com//job/daos-stack/job/daos/view/change-requests/job/PR-14661/5/execution/node/799/log

[daosbuild1]

Test stage Functional on EL 8.8 completed with status FAILURE. https://build.hpdd.intel.com//job/daos-stack/job/daos/view/change-requests/job/PR-14661/6/execution/node/798/log

[daosbuild1]

Test stage Functional on EL 8.8 completed with status FAILURE. https://build.hpdd.intel.com//job/daos-stack/job/daos/view/change-requests/job/PR-14661/7/execution/node/798/log