Make it possible to tell segment gatherer that all the files are local

[pnuu]

With this PR it is possible to set a configuration option (all_files_are_local = True) that tells segment gatherer all the files to be local independent of the possible transport scheme (for example scp://) or host (foo.bar.com) in the received message metadata URI.

[codecov[bot]]

Codecov Report

Merging #133 (a939700) into main (5b40ded) will increase coverage by 0.06%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #133      +/-   ##
==========================================
+ Coverage   91.25%   91.32%   +0.06%     
==========================================
  Files          27       27              
  Lines        4015     4044      +29     
==========================================
+ Hits         3664     3693      +29     
  Misses        351      351              

Flag	Coverage Δ
unittests	91.32% <100.00%> (+0.06%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pytroll_collectors/segments.py	92.50% <100.00%> (+0.18%)	:arrow_up:
pytroll_collectors/tests/test_segments.py	100.00% <100.00%> (ø)

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[coveralls]

Pull Request Test Coverage Report for Build 4529914940

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 0.0%

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Totals
Change from base Build 4469504537:	0.0%
Covered Lines:	0
Relevant Lines:	0

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💛 - Coveralls

[pnuu]

Did a live test and the scheme and host were stripped as intended.

[pnuu]

The new option is now also in the documentation.