DAOS-13539 control: Fix network related commands for multiprovider

[kjacque]

• By default dmg network scan will include all configured providers, not just the primary provider.
• In daos_agent dump-attachinfo, use the agent config as the source for the provider index.

Features: control

Required-githooks: true

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[github-actions]

Bug-tracker data:
Ticket title is 'feature/multiprovider: dmg network scan and daos_agent dump-getattachinfo show primary provider even when running on secondary'
Status is 'In Review'
Labels: 'triaged'
https://daosio.atlassian.net/browse/DAOS-13539

[daosbuild1]

LGTM. No errors found by checkpatch.

[knard38]

LGTM for what I understand.