Feature/nat 212 213

This PR covers NAT-212 and NAT-213.

requested review from @simone.spinelli

added 29 commits

• 96b3f7be...44cd9de1 - 28 commits from branch develop
• 693343c6 - NAT-212/213: merge develop

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added 1 commit

• 5ed5cb0d - NAT-212/213: tox after merge develop

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added 1 commit

• f4fb59ad - NAT-212/213: Make tox (black) sotp failing

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added 1 commit

• cfe528c9 - NAT-212/213: Remove unused _ipam.py file (now everything is in ipam.py)

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added 1 commit

• e60abb23 - NAT-212/213: try to fix lint-documentation

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added 1 commit

• bbbeb78f - NAT-212/213: revert change in tox.ini related to black

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added 17 commits

• bbbeb78f...3d68aec1 - 7 earlier commits
• 081469f9 - Rebase develop
• e5722aa3 - Add ISIS and Ping checks to create iptrunk
• 6c6f51cb - Commenting out the whole insert_in_ibgp since should not have been here
• 6f6be978 - Run black to pass pipeline
• e9ee048c - More black adjustments
• 9f48bf3b - Remove trash
• a97bc163 - ipam file from the branch
• 73769173 - Manually fix more conflicts
• f1ff089d - Manually fix more conflicts
• 098a0e4c - And mode conflicts

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added 14 commits

• 098a0e4c...b01f4512 - 13 commits from branch develop
• e837aca0 - Merge branch 'develop' into feature/nat-212-213

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added 1 commit

• e60d6f9e - Making linters happy

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enabled an automatic merge when the pipeline for e60d6f9e succeeds

merged