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

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[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

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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

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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

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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

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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