Don't parse npm scripts for dynamic config

[maturanomx]

Fix the fix merged with #1575

The original patch was done over a block of code moved on #1667 resulting in re-introducing code that now is not invoked and continue with the bug reported on #916.

This patch take the original changes and put them in the current correct place.

Proof:

---

My PR is a:

🐛 Bug fix

Main update on the:

Plugin

[maturanomx]

Travis fails. This is from the log:

📦  Linking strapi-lint
npm ERR! code E503
npm ERR! 503 No backends available: @xtuc/long@4.2.1
npm ERR! A complete log of this run can be found in:
npm ERR!     /home/travis/.npm/_logs/2018-09-19T23_36_07_284Z-debug.log
npm ERR! code E503
npm ERR! 503 No backends available: @xtuc/long@4.2.1

In my local I also have problem with exactly the same dependency, just I was getting a 404 error. Temporary problems with the registry? coincidence is the same library? is a new dependency? 🤔

[lauriejim]

I have restart tests, looks working well.

[maturanomx]

I have restart tests, looks working well.

Oh!, you mean the Travis tests :)

Just for add information, this is from master reproducing #916 :

[lauriejim]

LGTM! Thank you

[lauriejim]

Have to check for the issue you screenshot.