Python plugin: add process-dependency-links to the pull_properties

[touilleMan]

• Have you followed the guidelines for contributing?
• Have you signed the CLA?
  ==> Contributor form ask me for my Launchpad ID but I don't know how to get it (the link provided lead me to https://login.launchpad.net/ which show my personal details, but not this id...)
  ==> Contributor form also ask me for a "Project contact", no idea what to put there
• If this is a bugfix. Have you checked that there is a bug report open for the issue you are trying to fix on bug reports?
• If this is a new feature. Have you discussed the design on the forum?
• Have you successfully run ./runtests.sh static?
• Have you successfully run ./runtests.sh unit?

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Currently process-dependency-links option is not considered as a pull_properties i.e. build of this part won't be restarted if this option change. I guess this is not intended given this option do change the dependencies resolution.

[sergiusens]

thank you for the contribution.
I will ignore the CLA step as it is a one liner, but let me explain the launchpad id part for future PRs. Launchpad lives on launchpad.net, you can reach your home page provided that you are logged in by going to https://launchpad.net/~/
As an example, my launchpad home page is https://launchpad.net/~sergiusens and by going there you can see that the launchpad id is at the top left of the page (mine is sergiusens, which matches the ~ url as well).

[touilleMan]

@sergiusens Thanks for the tip, I've signed the CLA now ;-)

[codecov-io]

Codecov Report

Merging #2190 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #2190      +/-   ##
==========================================
+ Coverage   91.22%   91.24%   +0.02%     
==========================================
  Files         201      201              
  Lines       12898    12898              
  Branches     1912     1912              
==========================================
+ Hits        11766    11769       +3     
+ Misses        768      767       -1     
+ Partials      364      362       -2

Impacted Files	Coverage Δ
snapcraft/plugins/python.py	89.56% <100%> (ø)	⬆️
snapcraft/internal/elf.py	83.17% <0%> (+0.32%)	⬆️
snapcraft/internal/pluginhandler/_plugin_loader.py	93.75% <0%> (+1.78%)	⬆️

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