Update docker to 1.12.5

Note the new ubuntu/debian version string change:
https://github.com/docker/docker/issues/29355

roles/docker/vars/debian.yml

@@ -6,7 +6,7 @@ docker_versioned_pkg:
   '1.9': docker-engine=1.9.1-0~{{ ansible_distribution_release|lower }}
   '1.10': docker-engine=1.10.3-0~{{ ansible_distribution_release|lower }}
   '1.11': docker-engine=1.11.2-0~{{ ansible_distribution_release|lower }}
-  '1.12': docker-engine=1.12.1-0~{{ ansible_distribution_release|lower }}
+  '1.12': docker-engine=1.12.5-0~debian-{{ ansible_distribution_release|lower }}
 
 docker_package_info:
   pkg_mgr: apt

roles/docker/vars/fedora.yml

@@ -5,7 +5,7 @@ docker_versioned_pkg:
   '1.9': docker-1:1.9.1
   '1.10': docker-1:1.10.1
   '1.11': docker-1:1.11.2
-  '1.12': docker-1:1.12.1
+  '1.12': docker-1:1.12.5
 
 docker_package_info:
   pkg_mgr: dnf

roles/docker/vars/ubuntu-16.04.yml

@@ -6,7 +6,7 @@ docker_kernel_min_version: '3.2'
 docker_versioned_pkg:
   'latest': docker-engine
   '1.11': docker-engine=1.11.1-0~{{ ansible_distribution_release|lower }}
-  '1.12': docker-engine=1.12.1-0~{{ ansible_distribution_release|lower }}
+  '1.12': docker-engine=1.12.5-0~ubuntu-{{ ansible_distribution_release|lower }}
 
 docker_package_info:
   pkg_mgr: apt

roles/docker/vars/ubuntu.yml

@@ -7,7 +7,7 @@ docker_versioned_pkg:
   '1.9': docker-engine=1.9.0-0~{{ ansible_distribution_release|lower }}
   '1.10': docker-engine=1.10.3-0~{{ ansible_distribution_release|lower }}
   '1.11': docker-engine=1.11.1-0~{{ ansible_distribution_release|lower }}
-  '1.12': docker-engine=1.12.1-0~{{ ansible_distribution_release|lower }}
+  '1.12': docker-engine=1.12.5-0~ubuntu-{{ ansible_distribution_release|lower }}
 
 docker_package_info:
   pkg_mgr: apt