Remove unused imports and fix docstring location

[maxnoe]

No description provided.

[rlopezcoto]

Maybe the same here as #312, this may be in conflict with #304...

[maxnoe]

Yes, but it's a small change and #304 needs conflict resolution anyways

[rlopezcoto]

Ok, so let's wait on @moralejo's opinion so we can decide where to merge them

[rlopezcoto]

After merging #304, could you please revise this and #312? There are currently conflicts and some of this was already implemented

[codecov]

Codecov Report

Merging #315 into master will increase coverage by 0.09%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #315      +/-   ##
==========================================
+ Coverage   41.73%   41.83%   +0.09%     
==========================================
  Files          69       69              
  Lines        4771     4762       -9     
==========================================
+ Hits         1991     1992       +1     
+ Misses       2780     2770      -10     

Impacted Files	Coverage Δ
...stchain/scripts/lstchain_data_muon_analysis_dl1.py	0.00% <0.00%> (ø)
lstchain/mc/sensitivity.py	98.64% <0.00%> (+0.33%)	⬆️

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[maxnoe]

@rlopezcoto I rebased vs master