Add provides for Chef 15+ compatibility

[ziggythehamster]

Description

This cookbook wasn't working in Chef 15+ because it was missing a provides :zfs.

Issues Resolved

This cookbook works in Chef 15, 16, 17, and 18 now.

Check List

• All tests pass. See https://github.com/chef-cookbooks/community_cookbook_documentation/blob/master/TESTING.MD
• New functionality includes testing.
• New functionality has been documented in the README if applicable
• All commits have been signed for the Developer Certificate of Origin. See https://github.com/chef-cookbooks/community_cookbook_documentation/blob/master/CONTRIBUTING.MD (this is a trivial/obvious change, so is theoretically not required)