Use Posttroll socket functions

[mraspaud]

This thus allows trollmoves to use posttroll security features: zap handshake, white-listing and curve authentification

• Closes #xxxx
• Tests added
• Fully documented
• Add your name to AUTHORS.md if not there already

[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.24%. Comparing base (b85c076) to head (4b115b4).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
trollmoves/move_it_req.py	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #233      +/-   ##
==========================================
- Coverage   85.33%   85.24%   -0.10%     
==========================================
  Files          37       37              
  Lines        6670     6697      +27     
==========================================
+ Hits         5692     5709      +17     
- Misses        978      988      +10     

Flag	Coverage Δ
unittests	85.24% <75.00%> (-0.10%)	⬇️

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