Update to recent version of Foodcritic, fix related FC issues

[hrak]

• Upgrade Foodcritic to ~> 6.0
• Define use_inline_resources in providers (FC057) if supported
• Define source_url and issues_url in metadata (FC064 & FC065) if supported

[martinb3]

Hello! use_inline_resources actually appears to break all of the test suites that start with ^override. This is because this cookbook relies on finding/collecting resources for users, installation, configuration, and setting up a service.

We probably need to simply disable this rule. See also Foodcritic/foodcritic#419.

[hrak]

Hi Martin, before filing the PR I ran all tests (rubocop/foodcritic/rspec) except the integration tests, because they blow up my laptop :)

I ran the ^override tests individually and could reproduce your issue. Since the cookbook relies on the resources defined in the individual providers and i can't really think of an easy way to fix this in a clean and backwards compatible way, i have updated the PR to revert the use_inline_resources changes, and have added a .foodcritic file to disable the FC057 rule.

[martinb3]

Hello @hrak! No problem -- I think that's all we can really do (is disable the rule). Once it passes, I'll merge 👍

[martinb3]

I've incorporated your commits/changes at 9eb4c1e. I didn't want to merge in the commits that broke it as part of the history. Thank you!