DAOS-16687 control: Handle missing PCIe caps in storage query usage

[tanabarr]

Missing PCIe capabilities when querying a NVMe SSD's configuration
space is unusual but should be handled gracefully by the control-plane
and shouldn't cause a failure to return usage statistics when calling
dmg storage query usage.

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

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• 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.
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  • Review comments are sufficiently resolved, particularly by prior reviewers that requested changes.
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• 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 'dmg storage query usage fails if no PCIe capabilities'
Status is 'In Review'
https://daosio.atlassian.net/browse/DAOS-16687

[daosbuild1]

Test stage Build on EL 8 completed with status FAILURE. https://build.hpdd.intel.com//job/daos-stack/job/daos/view/change-requests/job/PR-15297/1/execution/node/341/log

[daosbuild1]

Test stage Build on Leap 15.5 with Intel-C and TARGET_PREFIX completed with status FAILURE. https://build.hpdd.intel.com//job/daos-stack/job/daos/view/change-requests/job/PR-15297/1/execution/node/387/log

[daosbuild1]

Test stage Build RPM on EL 9 completed with status FAILURE. https://build.hpdd.intel.com//job/daos-stack/job/daos/view/change-requests/job/PR-15297/1/execution/node/335/log

[daosbuild1]

Test stage Build RPM on EL 8 completed with status FAILURE. https://build.hpdd.intel.com//job/daos-stack/job/daos/view/change-requests/job/PR-15297/1/execution/node/273/log

[daosbuild1]

Test stage Build RPM on Leap 15.5 completed with status FAILURE. https://build.hpdd.intel.com//job/daos-stack/job/daos/view/change-requests/job/PR-15297/1/execution/node/313/log

[daosbuild1]

Test stage Build DEB on Ubuntu 20.04 completed with status FAILURE. https://build.hpdd.intel.com//job/daos-stack/job/daos/view/change-requests/job/PR-15297/1/execution/node/363/log

[tanabarr]

replaced by #15392