1996 agent worm config decouple

[VakarisZ]

What does this PR do?

Mitigates the coupling of agent codebase to current_server property in worm config, by using server address from control channel and control client #1996

Add any further explanations here.

PR Checklist

• Have you added an explanation of what your changes do and why you'd like to include them?
• Is the TravisCI build passing?
• Was the CHANGELOG.md updated to reflect the changes?
• Was the documentation framework updated to reflect the changes?
• Have you checked that you haven't introduced any duplicate code?

Testing Checklist

• Added relevant unit tests?
• Have you successfully tested your changes locally? Elaborate:

  Tested by running unit tests
  Tested by running manual test, infecting machines

• If applicable, add screenshots or log transcripts of the feature working

[codecov]

Codecov Report

Merging #2016 (5ff617b) into develop (133f7f5) will increase coverage by 0.05%.
The diff coverage is 36.36%.

@@             Coverage Diff             @@
##           develop    #2016      +/-   ##
===========================================
+ Coverage    56.63%   56.69%   +0.05%     
===========================================
  Files          463      463              
  Lines        12894    12883      -11     
===========================================
+ Hits          7303     7304       +1     
+ Misses        5591     5579      -12     

Impacted Files	Coverage Δ
monkey/infection_monkey/monkey.py	0.00% <0.00%> (ø)
monkey/infection_monkey/control.py	32.74% <36.36%> (+2.49%)	⬆️
monkey/infection_monkey/master/control_channel.py	34.14% <66.66%> (-0.86%)	⬇️
...ection_monkey/post_breach/custom_pba/custom_pba.py	63.33% <66.66%> (ø)
monkey/infection_monkey/config.py	31.81% <100.00%> (-2.97%)	⬇️
monkey/infection_monkey/telemetry/base_telem.py	100.00% <100.00%> (ø)
monkey/infection_monkey/telemetry/tunnel_telem.py	100.00% <100.00%> (ø)
.../unit_tests/infection_monkey/telemetry/conftest.py	100.00% <100.00%> (ø)

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[mssalvatore]

Just two small changes in the unit tests