Make the existing playbooks pass the new checks

Strip trailing whitespace and blank lines, name the getent tasks, and fix Jinja spacing.

iot/roles/mosquitto/tasks/main.yaml

@@ -1,6 +1,7 @@
 ---
 # Tasks for Mosquitto role
-- getent:
+- name: Look up the Mosquitto user
+  getent:
     database: passwd
     key: "{{ mosquitto_user }}"
     split: ":"
@@ -79,4 +80,3 @@
 
 - name: Encrypt the docker file
   command: docker exec -i mosquitto mosquitto_passwd -U /mosquitto/config/passwd
-