Fix sst standard name

[eysteinn]

Fix error in standard_name for quality_level in Sentinel-3 slstr_l2 reader

[djhoese]

Looks good. Too bad there isn't a real CF standard name for this value.

[mraspaud]

Would this be status flags like this ? http://cfconventions.org/Data/cf-conventions/cf-conventions-1.7/build/ch03s05.html

[eysteinn]

I'm using the internal variable names as they appear in the nc file

[coveralls]

Coverage increased (+0.003%) to 88.081% when pulling 5522180 on eysteinn:fix_sst_standard_name into 6b0959e on pytroll:master.

[codecov]

Codecov Report

Merging #1055 into master will increase coverage by 0.53%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1055      +/-   ##
==========================================
+ Coverage   87.55%   88.09%   +0.53%     
==========================================
  Files         190      191       +1     
  Lines       29324    29431     +107     
==========================================
+ Hits        25676    25927     +251     
+ Misses       3648     3504     -144     

Impacted Files	Coverage Δ
satpy/tests/reader_tests/test_aapp_l1b.py	100.00% <0.00%> (ø)
satpy/tests/reader_tests/test_seviri_l2_bufr.py	94.11% <0.00%> (+0.36%)	⬆️
satpy/readers/seviri_l2_bufr.py	93.90% <0.00%> (+1.36%)	⬆️
satpy/readers/aapp_l1b.py	86.27% <0.00%> (+71.91%)	⬆️

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[mraspaud]

Ok, that's reasonable.