Add new bot: cut string by delimeter, max length

[mariuskarotkis]

Add new bot: cut string by delimeter, max length

[ghost]

Making a string shorter in the Python world is usually called truncating (see for example the jinja2 truncate filter), so calling the bot something like TruncateByDelimiter is maybe a more descriptive name.

Please also add a reuse compliant license and copyright header to the files.

As a long term solution it might make more sense to implement a separate bot for string field manipulation, like a JinjaBot which then can do all the jinja filters and which would make it easier to add custom filters. @wagner-certat what do you think?

[codecov-commenter]

Codecov Report

Merging #1967 (4005eed) into develop (0750a3d) will increase coverage by 0.31%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop    #1967      +/-   ##
===========================================
+ Coverage    75.74%   76.06%   +0.31%     
===========================================
  Files          414      425      +11     
  Lines        22169    22825     +656     
  Branches      2944     3024      +80     
===========================================
+ Hits         16793    17361     +568     
- Misses        4697     4757      +60     
- Partials       679      707      +28     

Impacted Files	Coverage Δ
...telmq/bots/experts/truncate_by_delimiter/expert.py	100.00% <100.00%> (ø)
.../bots/experts/truncate_by_delimiter/test_expert.py	100.00% <100.00%> (ø)
intelmq/tests/bots/experts/wait/test_expert.py	50.00% <0.00%> (-50.00%)	⬇️
intelmq/bots/experts/wait/expert.py	48.57% <0.00%> (-31.43%)	⬇️
intelmq/bots/parsers/cert_eu/parser_csv.py	78.84% <0.00%> (-2.79%)	⬇️
intelmq/bots/parsers/misp/parser.py	85.45% <0.00%> (-2.79%)	⬇️
intelmq/lib/upgrades.py	69.01% <0.00%> (-1.18%)	⬇️
intelmq/lib/test.py	91.51% <0.00%> (-0.32%)	⬇️
intelmq/tests/test_conf.py	95.38% <0.00%> (-0.07%)	⬇️
intelmq/bin/intelmqctl.py	12.84% <0.00%> (-0.05%)	⬇️
... and 408 more

[ghost]

Could you please add a license header like

# SPDX-FileCopyrightText: 2018 <your name/mailaddress>
#
# SPDX-License-Identifier: AGPL-3.0-or-later

to

• intelmq/bots/experts/truncate_by_delimiter/expert.py
• intelmq/tests/bots/experts/truncate_by_delimiter/test_expert.py
  Thanks

Please describe better, how the bot works so that it's not necessary to study the code before using it. It's not clear from the current docs how delimiter and max_length work together. Maybe add some usage examples which demonstrate it's capabilities, e.g. with max_length = 0 and max_length > 0, and a.b.c.example.com with max_length = 13 and = 15.

[ghost]

Thanks again for your contribution! And sorry for the long waiting time - several issues at the same time forced us to set the focus elsewhere :/