Fix adding docker GPG key & repo on Centos 7.1

Same problem as #7

tasks/setup-RedHat.yml

@@ -12,6 +12,28 @@
   rpm_key:
     key: https://download.docker.com/linux/centos/gpg
     state: present
+  register: add_repository_key
+  ignore_errors: true
+
+- name: Ensure curl is present (on older systems without SNI).
+  package: name=curl state=present
+  when: add_repository_key|failed
+
+- name: Download GPG key (alternative for older systems without SNI).
+  shell: 'curl -sSL https://download.docker.com/linux/ubuntu/gpg -o /tmp/docker-gpg'
+  args:
+    warn: no
+  when: add_repository_key|failed 
+
+- name: Add Docker GPG key (alternative for older systems without SNI).
+  shell: 'rpm --import /tmp/docker-gpg'
+  args:
+    warn: no
+  when: add_repository_key|failed
+
+- file:
+    path: '/tmp/docker-gpg'
+    state: absent
 
 - name: Add Docker repository.
   get_url:
@@ -20,6 +42,23 @@
     owner: root
     group: root
     mode: 0644
+  register: add_repository
+  ignore_errors: true
+
+- name: Add Docker repository (on older systems without SNI).
+  shell: 'curl -sSL {{ docker_yum_repo_url }} -o /etc/yum.repos.d/docker-{{ docker_edition }}.repo'
+  args:
+    warn: no
+  when: add_repository|failed
+
+- name: Set permission on .repo file (on older systems without SNI).
+  file:
+    path: '/etc/yum.repos.d/docker-{{ docker_edition }}.repo'
+    state: file
+    owner: root
+    group: root
+    mode: 0644
+  when: add_repository|failed
 
 - name: Configure Docker Edge repo.
   ini_file: