Add a flag to configure an link-local address to veth0 for istio

[cyclinder]

Thanks for contributing!

Notice:

• [ ] unite test or E2E test
• [ ] do not forget essential code comment and log
• [ ] document for the PR
• [ ] release note label "release/none" "release/bug" "release/feature"
• [ ] read about Contribution notice: https://spidernet-io.github.io/spiderpool/latest/develop/contributing/

What issue(s) does this PR fix:

Fixes https://github.com/spidernet-io/spiderpool/issues/4250

Special notes for your reviewer:

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 81.06%. Comparing base (5179a27) to head (3fb3c4e). Report is 2 commits behind head on release-v0.8.

Additional details and impacted files

[](https://app.codecov.io/gh/spidernet-io/spiderpool/pull/4261?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=spidernet-io) ```diff @@ Coverage Diff @@ ## release-v0.8 #4261 +/- ## ============================================= Coverage 81.06% 81.06% ============================================= Files 49 49 Lines 5418 5418 ============================================= Hits 4392 4392 Misses 864 864 Partials 162 162 ``` | [Flag](https://app.codecov.io/gh/spidernet-io/spiderpool/pull/4261/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=spidernet-io) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/spidernet-io/spiderpool/pull/4261/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=spidernet-io) | `81.06% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=spidernet-io#carryforward-flags-in-the-pull-request-comment) to find out more.