Bugfix segment gathering when segment name has a dash in it

[pnuu]

This is a fix for segment gathering case where a segment name has a dash in it, like CRR-Ph.

The filename composition tests were refactored along the way.

[codecov[bot]]

Codecov Report

Merging #131 (b274001) into main (f8ed96c) will increase coverage by 0.34%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #131      +/-   ##
==========================================
+ Coverage   90.15%   90.50%   +0.34%     
==========================================
  Files          25       25              
  Lines        3779     3865      +86     
==========================================
+ Hits         3407     3498      +91     
+ Misses        372      367       -5     

Impacted Files	Coverage Δ
pytroll_collectors/segments.py	92.32% <100.00%> (+0.20%)	:arrow_up:
pytroll_collectors/tests/test_segments.py	100.00% <100.00%> (+0.72%)	:arrow_up:

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[pnuu]

@mraspaud @adybbroe any comments?