BGP: Minimize dragging keys of sparsewalk response along

[johannaengland]

This is as preparation for #179 and is one step in fixing #180 (the rest will be done when working on #179).

[github-actions[bot]]

Test results

    3 files      3 suites   31s :stopwatch: 289 tests 289 :heavy_check_mark: 0 :zzz: 0 :x: 867 runs  865 :heavy_check_mark: 2 :zzz: 0 :x:

Results for commit c9909f3b.

:recycle: This comment has been updated with latest results.

[codecov[bot]]

Codecov Report

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

Project coverage is 98.86%. Comparing base (7e599b6) to head (c9909f3).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #181 +/- ## ========================================== + Coverage 98.84% 98.86% +0.02% ========================================== Files 41 41 Lines 5428 5422 -6 ========================================== - Hits 5365 5360 -5 + Misses 63 62 -1 ```

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[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud