write array info a la ctapipe v0.8

[vuillaut]

Double the info (small overhead) for now to not change the data format.
This is temporary for lstchain v0.6

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Codecov Report

Merging #466 into lstchain_ctapipe0.8 will increase coverage by 0.07%.
The diff coverage is 100.00%.

@@                   Coverage Diff                   @@
##           lstchain_ctapipe0.8     #466      +/-   ##
=======================================================
+ Coverage                41.63%   41.71%   +0.07%     
=======================================================
  Files                       76       76              
  Lines                     6199     6207       +8     
=======================================================
+ Hits                      2581     2589       +8     
  Misses                    3618     3618              

Impacted Files	Coverage Δ
lstchain/io/io.py	82.33% <100.00%> (+0.38%)	⬆️
lstchain/reco/r0_to_dl1.py	65.08% <100.00%> (+0.23%)	⬆️

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[vuillaut]