Enterprise Kapacitor packages should have have all sections with example values

Example there are no sample lines for the following sections:

[enterprise]
(license keys)
[cluster]

[alert]

Start by locating the Enterprise Kapacitor package configuration examples referenced by this issue; the payload does not name a file or test. Add sample lines for the [enterprise], [cluster], and [alert] sections, including license-key examples, and confirm that each section is represented without exposing real credentials.

Written by the indexing model from the issue text.