dhclient: T6667: Added workaround for communication with FRR

[zdc]

Change Summary

Added workaround for communication with FRR

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/T6667

Related PR(s)

Component(s) name

dhclient

Proposed changes

To increase the chance for dhclient to configure routes in FRR, added a workaround. Now 10 attempts are performed with 1 second delay and only after this dhclient gives up.

How to test

Unfortunately, the issue is hard to catch, using VyOS config scripts only, without explicitly forcing it.
More details about reproducing are in: https://vyos.dev/T6667

Smoketest result

N/A

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

[github-actions]

👍
No issues in PR Title / Commit Title

[github-actions]

✅ No issues found in unused-imports check.. Please refer the workflow run

[dmbaturin]

Looks good, I think log message wording can be improved, though.

[zdc]

@Mergifyio backport sagitta

[mergify]

backport sagitta

✅ Backports have been created

• #4102 dhclient: T6667: Added workaround for communication with FRR (backport #4002) has been created for branch sagitta

[zdc]

@Mergifyio backport circinus

[mergify]

backport circinus

✅ Backports have been created

• #4103 dhclient: T6667: Added workaround for communication with FRR (backport #4002) has been created for branch circinus