opmode: T7084: reorganize the op mode cache format for ease of search

[dmbaturin]

Change summary

• Move node children to children field.
• Flatten node dicts and move properties (completion help, etc.) to the top level.

[
  {
    "name": "show",
    "type": "node",
    "comp_help": {},
    "command": null,
    "path": [
      "show"
    ],
    "children": [
      {
        "name": "kernel",
        "type": "node",
        "comp_help": {},
        "command": null,
        "path": [
          "show",
          "kernel"
        ],
        "children": [
          {
            "name": "modules",
            "type": "node",
            "comp_help": {},
            "command": "sudo /usr/libexec/vyos//op_mode/kernel_modules.py show",
            "path": [
              "show",
              "kernel",
              "modules"
            ],
            "children": []
          }
        ]
      }
    ]
  },

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):

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• I have read the CONTRIBUTING document
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• I have run the components SMOKETESTS if applicable
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• My change requires a change to the documentation
• I have updated the documentation accordingly

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