Add .yamllint config to provider generators

[imtayadeway]

Provides a config so the yaml linter can be run on the provider repos.

I've made the default line length rather long (1000) to account for vcr cassettes which tend to extend hundreds of characters in width - we can look into tuning this or alternatively ignoring cassettes (since they are generated).

[agrare]

@imtayadeway ran a quick wc -L on some provider VCRs and some of them are >70,000 chars wide so might be better to ignore spec/vcr_cassettes/**

[djberg96]

Agree with @agrare. Ok for other yaml spec files, but lets ignore cassettes for now.

[imtayadeway]

@agrare @djberg96 thanks for the recommendations! I added the cassettes path to the ignore list, and reduced the line length to 120 which I think is in line with the other linters.

[miq-bot]

Checked commit imtayadeway@6adcf97 with ruby 2.3.3, rubocop 0.52.1, haml-lint 0.20.0, and yamllint 1.10.0
1 file checked, 0 offenses detected
Everything looks fine. 👍

[djberg96]

👍