(PUP-2401) Add ssh_authorized_key acceptance tests

Add basic acceptance tests for ssh_authorized_key type.
This adds acceptance tests for create, query, modify, and destroy.

The query test is set to be skipped because the type cannot
currently be queried by username (see PUP-1605).
Merge pull request #2604 from johnduarte/pup-2401-ssh_authorized_key-acceptance

(PUP-2401) Add ssh_authorized_key acceptance tests
Merge branch 'master' of https://github.com/puppetlabs/puppet