Pin apt key ID

ID is specified so ansible can check if the key is already there without
downloading the file. Useful to keep the role woring when the key has
already been added on systems where DL won't work with the module
because of certificate validation (Ubuntu 14.04).

tasks/Debian.yml

@@ -15,6 +15,7 @@
 - name: Download Telegraf apt key.
   apt_key:
     url: "https://repos.influxdata.com/influxdb.key"
+    id: 2582E0C5
     state: present
   become: yes