Delegate dask delays to pyninjotiff

[mraspaud]

This PR makes satpy take advantage of the new features in pyninjotiff

• Tests passed
• Passes flake8 satpy

[coveralls]

Coverage increased (+0.01%) to 88.081% when pulling a23fb85 on mraspaud:fix-ninjotiff-writer into e25415b on pytroll:master.

[coveralls]

Coverage increased (+0.03%) to 88.103% when pulling 60397ac on mraspaud:fix-ninjotiff-writer into e25415b on pytroll:master.

[codecov]

Codecov Report

Merging #1052 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master   #1052      +/-   ##
=========================================
+ Coverage   88.08%   88.1%   +0.02%     
=========================================
  Files         191     191              
  Lines       29412   29435      +23     
=========================================
+ Hits        25907   25934      +27     
+ Misses       3505    3501       -4

Impacted Files	Coverage Δ
satpy/writers/ninjotiff.py	60% <100%> (+0.62%)	⬆️
satpy/tests/writer_tests/test_ninjotiff.py	100% <100%> (+2.17%)	⬆️
satpy/tests/compositor_tests/__init__.py	99.61% <0%> (-0.01%)	⬇️
satpy/readers/scmi.py	82.91% <0%> (ø)	⬆️
satpy/tests/reader_tests/test_agri_l1.py	99.01% <0%> (ø)	⬆️
satpy/tests/test_writers.py	98.05% <0%> (ø)	⬆️
satpy/scene.py	89.91% <0%> (+0.17%)	⬆️
satpy/writers/__init__.py	86.02% <0%> (+0.27%)	⬆️
satpy/tests/reader_tests/test_seviri_l2_bufr.py	94.11% <0%> (+0.36%)	⬆️
satpy/readers/seviri_l2_bufr.py	93.9% <0%> (+1.36%)	⬆️

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