Fix RuntimeError('dictionary keys changed during iteration')

[samuelbarata]

In the get_mac_address_table function, when processing the gNMI output of an interface with tagged sub-interfaces the function _dictToList will crash as dictionary keys are deleted during iteration.

gNMI example request:

gnmic -a 172.80.80.11:57400 -u admin -p password --skip-verify --path '/interface[name=lag2]/subinterface[index=1]/vlan/encap/single-tagged/vlan-id' -e 'JSON_IETF' get

Response that makes function crash:

[
  {
    "source": "172.80.80.11:57400",
    "timestamp": 1739035251823391605,
    "time": "2025-02-08T17:20:51.823391605Z",
    "updates": [
      {
        "Path": "srl_nokia-interfaces:interface[name=lag2]/subinterface[index=1]/srl_nokia-interfaces-vlans:vlan/encap/single-tagged/vlan-id",
        "values": {
          "srl_nokia-interfaces:interface/subinterface/srl_nokia-interfaces-vlans:vlan/encap/single-tagged/vlan-id": 1
        }
      }
    ]
  }
]

[hellt]

Thanks @samuelbarata
would you be willing to have a look at the failing clab startup in the test? I presume some config got outdated

[samuelbarata]

@hellt can you rerun the CI?

[samuelbarata]

@hellt Again please

[samuelbarata]

@hellt One last time (I hope)