breaking: remove support for debian 8

As mentioned in
https://github.com/voxpupuli/puppet-rabbitmq/tree/v10.2.0 debian 8

Author: Christoph Maser

.sync.yml

@@ -2,7 +2,6 @@
 .travis.yml:
   secure: "Ojc0h2mbt9Y+eCyiKD+x1iYNONOP27Me63hjo9jo2v1bSs3aiM7djlcpz/sG+jRJ7JQoUyaGzHSn+gvxwWqdagFfFgDmipMKD0OXQinq7upRaG2hR+akKo0jllq9zLjJGBDoxurioKfOzPGlt2bX3UYY5KyeJ3AIM4dwCGVtSh4="
   docker_sets:
-    - set: debian8-64
     - set: debian9-64
     - set: ubuntu1604-64
     - set: ubuntu1804-64

.travis.yml

@@ -24,14 +24,6 @@ jobs:
     - rvm: 2.4.4
       bundler_args: --without system_tests development release
       env: PUPPET_VERSION="~> 5.0" CHECK=build DEPLOY_TO_FORGE=yes
-    - rvm: 2.5.3
-      bundler_args: --without development release
-      env: BEAKER_PUPPET_COLLECTION=puppet5 BEAKER_setfile=debian8-64 CHECK=beaker
-      services: docker
-    - rvm: 2.5.3
-      bundler_args: --without development release
-      env: BEAKER_PUPPET_COLLECTION=puppet6 BEAKER_setfile=debian8-64 CHECK=beaker
-      services: docker
     - rvm: 2.5.3
       bundler_args: --without development release
       env: BEAKER_PUPPET_COLLECTION=puppet5 BEAKER_setfile=debian9-64 CHECK=beaker

metadata.json

@@ -25,7 +25,6 @@
     {
       "operatingsystem": "Debian",
       "operatingsystemrelease": [
-        "8",
         "9"
       ]
     },

spec/acceptance/nodesets/debian-8-x64.yml

@@ -7,8 +7,6 @@ def os_specific_facts(facts)
     { service_provider: 'systemd', systemd: true }
   when 'Debian'
     case facts[:os]['release']['major']
-    when '7'
-      { service_provider: 'sysv', systemd: false }
     when '14.04'
       { service_provider: 'upstart', systemd: false }
     else