Add lldp yang model to arista generate config

• Extend arista generate config with lldp yang models
• Generated models have been updated

added 3 commits

• c53bfd3d...5375777e - 2 commits from branch master
• f9e2fd20 - Add lldp yang model to arista generate config

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added 4 commits

• f9e2fd20...4bdc1033 - 3 commits from branch master
• cfcabedf - Add lldp yang model to arista generate config

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added 1 commit

• 34cb1800 - Update NextHop to use UnionString

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requested review from @hda11249, @istfaengl, and @istkarenk

approved this merge request

merged

mentioned in commit 699e5b96