cmd: add full unit test for test peers command

[KaloyanTanev]

Add proper unit test for peers - spinning up multiple peers and local relay and running the peer tests between them.

Some other minor improvements:

• use enrs of the deterministic private keys created in the beginning;
• remove logger init in testpeers.go;
• add prepare func;
• rename cfg to conf to be consistent with the rest of the codebase.

testpeers.go coverage has been increased to 86.4%.

category: test
ticket: #3064

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.84%. Comparing base (9c65c8d) to head (4d7e031).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3082      +/-   ##
==========================================
+ Coverage   56.44%   56.84%   +0.40%     
==========================================
  Files         208      208              
  Lines       29026    29022       -4     
==========================================
+ Hits        16384    16498     +114     
+ Misses      10823    10695     -128     
- Partials     1819     1829      +10     

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[KaloyanTanev]

Waiting on #3073 to be merged first.

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud