DAOS-17003 container: use thread instead of task

[NiuYawei]

Use ABT thread instead of ABT task for cont_refresh_track_eph_one(), since local tx is used in the function which yield in md-on-ssd mode.

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.
• Commit messages follows the guidelines outlined here.
• Any tests skipped by the ticket being addressed have been run and passed in the PR.

Gatekeeper:

• You are the appropriate gatekeeper to be landing the patch.
• The PR has 2 reviews by people familiar with the code, including appropriate owners.
• Githooks were used. If not, request that user install them and check copyright dates.
• Checkpatch issues are resolved. Pay particular attention to ones that will show up on future PRs.
• All builds have passed. Check non-required builds for any new compiler warnings.
• 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.
• Check the target branch. If it is master branch, should the PR go to a feature branch? If it is a release branch, does it have merge approval in the JIRA ticket.
• Extra checks if forced landing is requested
  • Review comments are sufficiently resolved, particularly by prior reviewers that requested changes.
  • No new NLT or valgrind warnings. Check the classic view.
  • Quick-build or Quick-functional is not used.
• Fix the commit message upon landing. Check the standard here. Edit it to create a single commit. If necessary, ask submitter for a new summary.

[github-actions]

Ticket title is 'aggregation/basic.py:DaosAggregationBasic.test_basic_aggregation - wait_tx_committed() Assertion 'd_list_empty(&wal_tx->td_link)' failed'
Status is 'In Review'
Labels: 'ci_master_daily,closed-master,md_on_ssd,pr_test'
https://daosio.atlassian.net/browse/DAOS-17003

[phender]

The following commit pragmas are required to run tests with md on ssd enabled as the stages are disabled for PRs by default:

Skip-func-hw-test-medium-md-on-ssd: false
Skip-func-hw-test-large-md-on-ssd: false

For future reference these can be found in https://daosio.atlassian.net/wiki/spaces/DC/pages/11891933554/Commit+Pragmas

[daosbuild1]

Test stage Functional Hardware Medium Verbs Provider completed with status FAILURE. https://build.hpdd.intel.com//job/daos-stack/job/daos/view/change-requests/job/PR-15845/2/execution/node/1550/log

[liuxuezhao]

right, thanks for the fix