DAOS-14348 client: GC for pil4dfs dentry cache

[knard38]

Miscellaneous

Hotfix of miscellaneous issues:

• invalid type of atomic_flag
• invalid usage of DL_WARN macro

Required-githooks: true

Before requesting gatekeeper:

• Two review approvals and any prior change requests have been resolved.
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• Any tests skipped by the ticket being addressed have been run and passed in the PR.

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  • No new NLT or valgrind warnings. Check the classic view.
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[github-actions]

Ticket title is 'pil4dfs dentry caching'
Status is 'Resolved'
Labels: 'intercept_lib'
https://daosio.atlassian.net/browse/DAOS-14348

[mchaarawi]

let's also create a 2.6 backport please since i will approve that to be merged there

[knard38]

let's also create a 2.6 backport please since i will approve that to be merged there

Done with PR #14996

[knard38]

@daos-stack/daos-gatekeeper , please could you lend this patch with the following messages:

• Title: DAOS-14348 client: GC for pil4dfs dentry cache
• Body:

Hotfix of miscellaneous issues:
- invalid type of atomic_flag
- invalid usage of DL_WARN macro