http-api: T3955: add commit-confirm to endpoints /configure /config-file

[jestabro]

Change summary

Requests to the endpoints /configure and /config-file may include a field confirm_time of type int, which if > 0 will invoke commit-confirm with timeout := confirm_time on success of the request operation (set|delete|load|merge).

Confirming the operation is performed with a request containing 'op': 'confirm' to the respective endpoint.

An example for a list of set operations to endpoint /configure; other cases are analogous:

└──> curl -k -X POST -d '{"key": "baz", "commands": [{"op": "set", "path": ["interfaces", "ethernet", "eth1", "address", "192.168.2.137/24"]},{"op": "set", "path": ["interfaces", "ethernet", "eth1", "description", "test"]}], "confirm_time": 1}' https://192.168.122.230/configure
{"success": true, "data": "Initialized commit-confirm; 1 minutes to confirm before reload\n", "error": null}% 

└──> curl -k -X POST -d '{"key": "baz", "op": "confirm"}' https://192.168.122.230/configure
{"success": true, "data": "Reload timer stopped\n", "error": null}% 

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, renaming)
• Refactoring (no functional changes)
• Migration from an old Vyatta component to vyos-1x, please link to related PR inside obsoleted component
• Other (please describe):

Related Task(s)

Related PR(s)

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Checklist:

• I have read the CONTRIBUTING document
• I have linked this PR to one or more Phabricator Task(s)
• I have run the components SMOKETESTS if applicable
• My commit headlines contain a valid Task id
• My change requires a change to the documentation
• I have updated the documentation accordingly
  T3955: add commit-confirm example vyos-documentation#1642

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• CLI Smoketests (no interfaces) 👍 passed
• CLI Smoketests (interfaces only) 👍 passed
• Config tests 👍 passed
• RAID1 tests 👍 passed
• TPM tests 👍 passed