[keepalived] Routers don't need buster-backports anymore

Signed-off-by: Yohann D'ANELLO <ynerant@crans.org>

roles/keepalived/tasks/main.yml

@@ -1,25 +1,4 @@
 ---
-- name: Add buster-backports to apt sources
-  apt_repository:
-    repo: deb {{ debian_mirror }} buster-backports main
-    state: present
-  when:
-    - ansible_distribution == "Debian"
-    - ansible_distribution_major_version | int == 10
-    - ansible_distribution_release == "buster"
-
-- name: Use buster-backports to install keepalived
-  template:
-    src: apt/preferences.d/keepalived.j2
-    dest: /etc/apt/preferences.d/keepalived
-    owner: root
-    group: root
-    mode: 0644
-  when:
-    - ansible_distribution == "Debian"
-    - ansible_distribution_major_version | int == 10
-    - ansible_distribution_release == "buster"
-
 - name: Install keepalived
   apt:
     update_cache: true