Drop EL7 support

Author: ehelms

metadata.json

@@ -31,21 +31,12 @@
     {
       "operatingsystem": "RedHat",
       "operatingsystemrelease": [
-        "7",
         "8"
       ]
     },
     {
       "operatingsystem": "CentOS",
       "operatingsystemrelease": [
-        "7",
-        "8"
-      ]
-    },
-    {
-      "operatingsystem": "Scientific",
-      "operatingsystemrelease": [
-        "7",
         "8"
       ]
     }

spec/classes/certs_qpid_spec.rb

@@ -2,7 +2,7 @@
 
 describe 'certs::qpid' do
   on_supported_os.each do |os, os_facts|
-    context "on #{os}", if: os_facts[:operatingsystemmajrelease] == '7' do
+    context "on #{os}" do
       let :facts do
         os_facts
       end

spec/spec_helper_acceptance.rb

@@ -1,6 +1,6 @@
 require 'voxpupuli/acceptance/spec_helper_acceptance'
 
-ENV['BEAKER_setfile'] ||= 'centos7-64{hostname=centos7-64.example.com}'
+ENV['BEAKER_setfile'] ||= 'centos8-64{hostname=centos8-64.example.com}'
 
 configure_beaker(modules: :fixtures) do |host|
   if fact_on(host, 'os.family') == 'RedHat'