bgp: T6151: Allow configuration of disable-ebgp-connected-route-check (backport #3212)

[mergify]

Allow configuration of disable-ebgp-connected-route-check when the next-hop is learned not connected.

Change Summary

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):

Related Task(s)

https://vyos.dev/T6151

Related PR(s)

Component(s) name

bgp

Proposed changes

How to test

vyos command :

set protocols bgp parameters disable-ebgp-connected-route-check

Smoketest result

vyos@vrf-test:~$ /usr/libexec/vyos/tests/smoke/cli/test_protocols_bgp.py
test_bgp_01_simple (__main__.TestProtocolsBGP.test_bgp_01_simple) ...

ok
test_bgp_02_neighbors (__main__.TestProtocolsBGP.test_bgp_02_neighbors) ...

ok
test_bgp_03_peer_groups (__main__.TestProtocolsBGP.test_bgp_03_peer_groups) ...

ok
----------------------------------------------------------------------
Ran 27 tests in 128.218s

OK

Checklist:

• I have read the CONTRIBUTING document
• I have linked this PR to one or more Phabricator Task(s)
• I have run the components SMOKETESTS if applicable
• My commit headlines contain a valid Task id
• My change requires a change to the documentation
• I have updated the documentation accordingly

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This is an automatic backport of pull request #3212 done by [Mergify](https://mergify.com).