setup applayer: update copyright years in files

[jufajardini]

setup applayer script: update copyright year to 2021 in template files
used by the script

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Link to redmine ticket:

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Describe changes:

• setup applayer script: update copyright year to 2021 in template files used by the script

#suricata-verify-pr:
#suricata-verify-repo:
#suricata-verify-branch:
#suricata-update-pr:
#suricata-update-repo:
#suricata-update-branch:
#libhtp-pr:
#libhtp-repo:
#libhtp-branch:

[codecov]

Codecov Report

Merging #5817 (8841f08) into master (62e665c) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #5817   +/-   ##
=======================================
  Coverage   72.38%   72.39%           
=======================================
  Files         604      604           
  Lines      179369   179369           
=======================================
+ Hits       129837   129850   +13     
+ Misses      49532    49519   -13     

Flag	Coverage Δ
suricata-verify	49.16% <ø> (+0.01%)	⬆️
unittests	63.07% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

[jasonish]

Generally the model we follow would have this be 2018-2021. The idea is that the first year is the year of creation, and the second year is the year of the last modification, in a sense to extend the copyright out from the most recent modification.

While legally the year specified is doesn't matter at all, I think we should remain consistent for what its worth.

[jufajardini]

I see, thank you, I wondered why some had two years while others had just one. I'll fix that.

[jufajardini]

Closed with: #5823