(#241) Apt: Write repo key to own file

Without setting the name attribute, the key will be added to the global
/etc/apt/trusted.gpg keyring. That is deprecated. Also we need to ensure
`id` isn't set, otherwise apt-key might be invoked to fetch the key from
a keyserver.

Author: bastelfreak

manifests/install.pp

@@ -92,7 +92,7 @@
           release  => 'stable',
           repos    => 'main',
           key      => {
-            'id'     => '9D539D90D3328DC7D6C8D3B9D8FF8E1F7DF8B07E',
+            'name'   => 'influxdata-archive.key',
             'source' => "${telegraf::repo_location}influxdata-archive_compat.key",
           },
         }