Add bridge as a valid family for chain tables

[luisfdez]

Pull Request (PR) description

Add bridge as a valid family to the regular expression validating the table parameter in the chain define.

This Pull Request (PR) fixes the following issues

Without this patch one cannot define chains belonging to tables of the bridge family as the validation of the table parameter blocks the input of names like bridge-filter.

[luisfdez]

Thanks @bastelfreak for fixing the reference.md. It was driving me crazy.

I tried with bundle exec rake strings:generate:reference.

Did you just use the puppet strings generate for the project?

[bastelfreak]

bundle exec rake strings:generate:reference is fine, but you need puppet-strings 3. If you do bundle update it should be fine.