[master] Add MySQL privilege SERVICE_CONNECTION_ADMIN

[bcremer]

Add MySQL dynamic privilege SERVICE_CONNECTION_ADMIN that was introduced in MySQL 8.0.14.

See:

• https://dev.mysql.com/doc/relnotes/mysql/8.0/en/news-8-0-14.html
• https://dev.mysql.com/doc/refman/8.0/en/administrative-connection-interface.html

What does this PR do?

What issues does this PR fix or reference?

Fixes:

Previous Behavior

mysql_grants.present is unable to add the SERVICE_CONNECTION_ADMIN privilege.

New Behavior

mysql_grants.present is able to add the SERVICE_CONNECTION_ADMIN privilege.

Merge requirements satisfied?

[NOTICE] Bug fixes or features added to Salt require tests.

• Docs
• Changelog - https://docs.saltproject.io/en/master/topics/development/changelog.html
• Tests written/updated

Commits signed with GPG?

Yes/No

Please review Salt's Contributing Guide for best practices.

See GitHub's page on GPG signing for more information about signing commits with GPG.

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[Ch3LL]

This will need a changelog

@garethgreenaway any opinions here on whether we should require test coverage here or not?

[bcremer]

Added a changelog file with the PR Number as index. Is that OK or do I need to create a Issue first and assign that number?

[Ch3LL]

Just added one request and just want to get @garethgreenaway 's review here to see if we would require testing here.

[garethgreenaway]

I'm good not including tests for this since it's not a potential breaking change and it's simply adding an additional permission type.

[welcome]

Congratulations on your first PR being merged! 🎉