CI: removal of EOL distros from testing and support

Signed-off-by: Artem Sidorenko <artem@posteo.de>

.kitchen.vagrant.yml

@@ -7,7 +7,6 @@ provisioner:
   require_chef_omnibus: 12.5.1
 
 platforms:
-- name: ubuntu-12.04
 - name: ubuntu-14.04
 - name: ubuntu-16.04
 - name: centos-6.8
@@ -19,7 +18,6 @@ platforms:
 - name: fedora-24
 - name: fedora-25
 - name: opensuse-leap-42.1
-- name: opensuse-13.2
 
 verifier:
   name: inspec

.kitchen.yml

@@ -15,9 +15,6 @@ verifier:
   sudo: true
 
 platforms:
-- name: ubuntu-12.04
-  driver:
-    image: ubuntu:12.04
 - name: ubuntu-14.04
   driver:
     image: ubuntu:14.04
@@ -27,24 +24,18 @@ platforms:
     intermediate_instructions:
     - RUN /usr/bin/apt-get update
     pid_one_command: /bin/systemd
-- name: centos-6.6
-  driver:
-    image: centos:6.6
-- name: centos-6.7
+- name: centos-6.8
   driver:
-    image: centos:6.7
+    image: centos:6.8
     intermediate_instructions:
       - RUN yum install -y initscripts
 - name: centos-7
   driver:
     image: centos:7
     pid_one_command: /usr/lib/systemd/systemd
-- name: oracle-6.6
-  driver:
-    image: oraclelinux:6.6
-- name: oracle-6.7
+- name: oracle-6.8
   driver:
-    image: oraclelinux:6.7
+    image: oraclelinux:6.8
 - name: oracle-7.1
   driver:
     image: oraclelinux:7.1
@@ -78,10 +69,6 @@ platforms:
   driver:
     image: opensuse:42.1
     pid_one_command: /usr/lib/systemd/systemd
-- name: opensuse-13
-  driver:
-    image: opensuse:13.2
-    pid_one_command: /usr/lib/systemd/systemd
 
 suites:
 - name: default

README.md

@@ -17,13 +17,12 @@ This cookbook provides secure ssh-client and ssh-server configurations. This coo
 ### Platform
 
 - Debian 7, 8
-- Ubuntu 12.04, 14.04, 16.04
+- Ubuntu 14.04, 16.04
 - RHEL 6, 7
 - CentOS 6, 7
 - Oracle Linux 6, 7
 - Fedora 24, 25
 - OpenSuse Leap 42.1
-- OpenSuse 13.2
 
 ## Attributes