docker: remove obsoletes=0 in yum.conf

This was introduced in ef7f5edbb3
obsoletes=0 is not present in the official repo config
https://download.docker.com/linux/centos/docker-ce.repo
so it might not be needed for some time

Signed-off-by: Etienne Champetier <champetier.etienne@gmail.com>

roles/container-engine/docker/tasks/main.yml

@@ -144,28 +144,11 @@
     - ansible_distribution in ["CentOS","RedHat"] and not is_ostree
     - yum_result.results | length == 0
 
-- name: Copy yum.conf for editing
-  copy:
-    src: "{{ yum_conf }}"
-    dest: "{{ docker_yum_conf }}"
-    remote_src: yes
-  when: ansible_distribution in ["CentOS","RedHat","OracleLinux"] and not is_ostree
-
-- name: Edit copy of yum.conf to set obsoletes=0
-  ini_file:
-    path: "{{ docker_yum_conf }}"
-    section: main
-    option: obsoletes
-    value: "0"
-    no_extra_spaces: true
-  when: ansible_distribution in ["CentOS","RedHat","OracleLinux"] and not is_ostree
-
 - name: ensure docker packages are installed
   action: "{{ docker_package_info.pkg_mgr }}"
   args:
     pkg: "{{ item.name }}"
     force: "{{ item.force|default(omit) }}"
-    conf_file: "{{ item.yum_conf|default(omit) }}"
     state: "{{ item.state | default('present') }}"
     update_cache: "{{ omit if ansible_distribution == 'Fedora' else True }}"
     enablerepo: "{{ item.repo | default(omit) }}"