Add LLDP collection in bmh

[shibaPuppy]

User Story
since ironic allows you to configure LLDP collection, you should similarly be able to enter LLDP values ​​in bmh status.
see your network topology, understand the physical connections between devices, and troubleshoot more efficiently.

Detailed Description
since LLDP information is collected at the ironic inspection stage, I think it should be collected at the same timing as HardwareData.

Anything else you would like to add:
#1227

If a new CR (ex. network discovery) is created, will a new controller be needed?
when I looked at the code again recently, I thought that going similar to PR would be the easiest direction without any changes.

/kind feature

[dtantsur]

I'm generally in favour of this idea but I'd like a design proposal on it since it adds API. I'd rather not see API that simply exposes everything that Ironic collects as raw information.

[Rozzii]

/triage accepted
I will close #1227 in favor of this issue, create a design proposal first please in the metal3-docs repo.

[shibaPuppy]

@dtantsur @Rozzii
I think it is reasonable to add LLDP content to the existing hardwareData.
do you think we need to add a new CR?
i think we can only start once this is decided.

[Rozzii]

I am fine with putting the LLDP data to the hardwareData, what about you @dtantsur ?

[dtantsur]

It depends on how much you want to add, really. If it's just a couple of fields, I'm good with that.

[metal3-io-bot]

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Mark the issue as fresh with /remove-lifecycle stale.
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/lifecycle stale

[Rozzii]

/remove-lifecycle stale
/lifecycle frozen