try to speedup the api testing by hosting the feeds locally

[Grotax]

No description provided.

[Grotax]

Seems like it doesn't make a huge difference if the feed is hosted locally by the php server.

Also it would probably not work with the favicon tests, there we may still need to fetch the real feed.

But at least news sends less requests to the internet and we don't depend on the feeds being online.

[codecov-commenter]

Codecov Report

Merging #1874 (767879c) into master (fca05d5) will decrease coverage by 0.17%.
The diff coverage is 86.95%.

@@             Coverage Diff              @@
##             master    #1874      +/-   ##
============================================
- Coverage     91.62%   91.45%   -0.18%     
- Complexity      778      792      +14     
============================================
  Files            65       65              
  Lines          2724     2775      +51     
============================================
+ Hits           2496     2538      +42     
- Misses          228      237       +9     

Impacted Files	Coverage Δ
lib/Cron/UpdaterJob.php	0.00% <0.00%> (ø)
lib/Db/ItemMapperV2.php	98.51% <60.00%> (-1.49%)	⬇️
lib/Service/FeedServiceV2.php	97.80% <81.81%> (-2.20%)	⬇️
lib/Fetcher/FeedFetcher.php	80.62% <95.00%> (+0.89%)	⬆️
lib/Db/Item.php	100.00% <100.00%> (ø)
lib/Db/NewsMapperV2.php	100.00% <100.00%> (ø)
lib/Utility/OPMLExporter.php	100.00% <100.00%> (ø)
lib/Command/ExploreGenerator.php	100.00% <0.00%> (ø)
lib/Explore/RecommendedSites.php	0.00% <0.00%> (ø)
lib/Controller/FeedController.php	100.00% <0.00%> (ø)
... and 6 more

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