Added new APT repository url and APT key id for docker

defaults/main.yml

@@ -1,6 +1,6 @@
 ---
 # lxc-docker is the default
-docker_pkg_name: lxc-docker
+docker_pkg_name: docker-engine
 # docker_pkg_name: docker.io
 
 # docker dns path for docker.io package ( changed at ubuntu 14.04 from docker to docker.io )
@@ -10,11 +10,11 @@ docker_defaults_file_path: /etc/default/docker
 # Important if running Ubuntu 12.04-13.10 and ssh on a non-standard port
 ssh_port: 22
 # Place to get apt repository key
-apt_key_url: http://get.docker.io/gpg
+apt_key_url: https://apt.dockerproject.org/gpg
 # apt repository key signature
-apt_key_sig: A88D21E9
+apt_key_sig: 2C52609D
 # Name of the apt repository for docker
-apt_repository: deb https://get.docker.com/ubuntu docker main
+apt_repository: deb https://apt.dockerproject.org/repo ubuntu-{{ ansible_distribution_release }} main
 # The following help expose a docker port or to add additional options when
 # running docker daemon.  The default is to not use any special options.
 #docker_opts: >