update example config script

[jos3p]

Description

• core modules and their .md files (connectors/databases) are read first and modules with the same name get ignored if found in opsdroid/ (should work if more modules get into core)
• no longer listing skills twice as un/commented
• generated and included new example_configuration.yaml built with the new version of the script
• removed shell from default modules (mentioned in the issue)
• fixed "yaml.load() without loader=... is deprecated" warning

Fixes #1019

Status

READY

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration.

• tox (docker fails cause permissions?) [fresh ubuntu 19]
  py36/py37/lint commands succeeded
• built the new example cfg
• tested building+running dockerimage myself

Checklist:

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation (if applicable)
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@2b04dab). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #1125   +/-   ##
=========================================
  Coverage          ?   99.91%           
=========================================
  Files             ?       46           
  Lines             ?     2489           
  Branches          ?        0           
=========================================
  Hits              ?     2487           
  Misses            ?        2           
  Partials          ?        0

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 2b04dab...5758c14. Read the comment docs.

[FabioRosado]

Thank you so much for working on this issue I've reviewed your changes and I'm happy with them 😄

We love to thank contributors by sending them opsdroid stickers! Fill in the claim form to get yours!