[interfaces] correctly enable interfaces on N3K

[NilashishC]

SUMMARY

• Fixes #749
• Supported N3K versions have L3 shutdown by default.

ISSUE TYPE

• Bugfix Pull Request

COMPONENT NAME

nxos_interfaces.py

[codecov[bot]]

Codecov Report

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

Comparison is base (1882f7c) 85.01% compared to head (7503cdd) 85.01%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #813 +/- ## ======================================= Coverage 85.01% 85.01% ======================================= Files 211 211 Lines 18230 18230 ======================================= Hits 15498 15498 Misses 2732 2732 ```

[softwarefactory-project-zuul[bot]]

Build succeeded. https://ansible.softwarefactory-project.io/zuul/buildset/e33b775589b943b7859b24c569e7f088

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