Change yml extensions

[greedybro]

closes #677

• galaxy.yml > galaxy.yaml (see: *.yml required, *.yaml not accepted ansible/ansible#81669)
• requirements.yml > requirements.yaml
• .config/molecule/config.yml > .config/molecule/config.yaml
• meta/runtime.yml > meta/runtime.yaml (see: *.yml required, *.yaml not accepted ansible/ansible#81669)
• molecule/*/*.yml > molecule/*/*.yaml
• molecule/*/goss/*.yml.j2 > molecule/*/goss/*.yaml.j2
• molecule/*/fixtures/*.yml > molecule/*/fixtures/*.yaml
• roles/*/defaults/*.yml > roles/*/defaults/*.yaml
• roles/*/handlers/*.yml > roles/*/handlers/*.yaml
• roles/*/meta/main.yml > roles/*/meta/main.yaml
• roles/*/tasks/*.yml > roles/*/tasks/*.yaml
• roles/*/vars/*.yml > roles/*/vars/*.yaml
• tests/integration/targets/*/tasks/*.yml > tests/integration/targets/*/tasks/*.yaml

[codecov-commenter]

Codecov Report

Merging #682 (bfde894) into master (5bfd08d) will increase coverage by 0.00%.
Report is 91 commits behind head on master.
The diff coverage is n/a.

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@@           Coverage Diff           @@
##           master     #682   +/-   ##
=======================================
  Coverage   94.21%   94.21%           
=======================================
  Files         106      106           
  Lines        4113     4116    +3     
  Branches      627      629    +2     
=======================================
+ Hits         3875     3878    +3     
  Misses        178      178           
  Partials       60       60           

see 2 files with indirect coverage changes

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