The influxdata-archive.key is designed to have a good user experience
during key rotations, but in order to do that, we need to properly
verify the key file's fingerprint and not its sha256sum (since the
primary key's fingerprint won't change with key rotations, but the
sha256sum necessarily will).
Update documentation for this to establish best practice and prepare
users for the upcoming key rotation.
Adjust dockerfiles to use this methodology.
- Updates Telegraf install instructions, adds more info to promote verifying downloads.
- Adds setup for tests.
- Makes tests pass in install and configuration docs.
- Adds Vale.sh exception to allow duration values inside code blocks.
- Adds Dockerfiles for convenience to test install procedures in CentOS and Ubuntu.
- Clarifies and fixes config file handling and specifying input and output plugins.