fix(instance_server): ignore diff for user_data.ssh-host-fingerprints

[Codelax]

Fix #2800

[codecov-commenter]

Codecov Report

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

Project coverage is 67.66%. Comparing base (fe86049) to head (5159471). Report is 225 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #2810 +/- ## ========================================== - Coverage 71.43% 67.66% -3.78% ========================================== Files 277 339 +62 Lines 35875 39927 +4052 ========================================== + Hits 25628 27015 +1387 - Misses 8028 10598 +2570 - Partials 2219 2314 +95 ```

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