Add support for Debian 11

Add metadata support for Debian 11, and use the "python3" package for
the entire Debian family. This appears to be valid for both currently
supported versions

Closes #1008

data/family/Debian.yaml

@@ -2,3 +2,4 @@
 rabbitmq::package_name: 'rabbitmq-server'
 rabbitmq::service_name: 'rabbitmq-server'
 rabbitmq::package_gpg_key: 'https://packagecloud.io/rabbitmq/rabbitmq-server/gpgkey'
+rabbitmq::python_package: 'python3'

metadata.json

@@ -23,7 +23,8 @@
     {
       "operatingsystem": "Debian",
       "operatingsystemrelease": [
-        "10"
+        "10",
+        "11"
       ]
     },
     {

spec/classes/rabbitmq_spec.rb

@@ -190,8 +190,9 @@
             is_expected.to contain_archive('rabbitmqadmin').with_source('http://1.1.1.1:15672/cli/rabbitmqadmin')
           end
 
-          it { is_expected.to contain_package('python') } if %w[RedHat Debian SUSE Archlinux].include?(os_facts[:os]['family'])
-          it { is_expected.to contain_package('python38') } if %w[FreeBSD].include?(os_facts[:os]['family'])
+          it { is_expected.to contain_package('python') } if %w[RedHat SUSE Archlinux].include?(os_facts[:os]['family'])
+          it { is_expected.to contain_package('python3') } if 'Debian'.include?(os_facts[:os]['family'])
+          it { is_expected.to contain_package('python38') } if 'FreeBSD'.include?(os_facts[:os]['family'])
         end
 
         context 'with manage_python false' do