feat(sysctl): Add p2p.kill_connection to sysctl

[msbrogli]

Motivation

We currently do not have the capacity to kill connections from sysctl. The only alternative is to kill all connections using SIGUSR1.

Acceptance Criteria

1. Add p2p.kill_connection to sysctl. The expected behavior is to kill a connection with a given peer-id or to kill all connections if the provided peer-id is "*".

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a7cf1ba) 85.37% compared to head (a1b160a) 85.43%.

❗ Current head a1b160a differs from pull request most recent head f4d6a28. Consider uploading reports for the commit f4d6a28 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #950      +/-   ##
==========================================
+ Coverage   85.37%   85.43%   +0.05%     
==========================================
  Files         291      290       -1     
  Lines       22526    22525       -1     
  Branches     3391     3390       -1     
==========================================
+ Hits        19232    19244      +12     
+ Misses       2624     2612      -12     
+ Partials      670      669       -1     

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