Add loop control to custom DNF repos

This avoids leaking repository credentials by suppressing the dict
output to only print the key.

Change-Id: Ic7aa0e4c4f625908aeb30de65edac8bce96af761
Related-Bug: #2087938

ansible/roles/dnf/tasks/custom-repo.yml

@@ -26,6 +26,8 @@
     username: "{{ item.value.username | default(omit) }}"
     state: "{{ item.value.state | default(omit)}}"
   with_dict: "{{ dnf_custom_repos }}"
+  loop_control:
+    label: "{{ item.key }}"
   register: register_dnf_command
   retries: 3
   delay: 10

releasenotes/notes/dnf-loop-control-6e2c8ba1915d2631.yaml

+---
+security:
+  - |
+    Avoid leaking DNF repository username/password credentials in the Kayobe
+    output by adding loop control to print only the repository key.
+    `LP#2087938 <https://launchpad.net/bugs/2087938>`__
+fixes:
+  - |
+    Avoid leaking DNF repository username/password credentials in the Kayobe
+    output by adding loop control to print only the repository key.
+    `LP#2087938 <https://launchpad.net/bugs/2087938>`__