Add full Amazon 2 support

[joshcooper]

Copies Amazon 7 to 2, as the former is an implementation detail and the latter is the actual OS version: https://aws.amazon.com/amazon-linux-2

I was able to run facter beaker tests with this PR and voxpupuli/beaker-hostgenerator#372

❯ env | grep BEAKER                                                                                     
BEAKER_VERSION=https://github.com/voxpupuli/beaker#amazon2
BEAKER_PUPPET_VERSION=~> 4.0
BEAKER_HOSTGENERATOR_VERSION=https://github.com/voxpupuli/beaker-hostgenerator#amazon2
❯ cd ~/work/facter/acceptance
❯ bundle update
❯ env SHA=c6c5de5b1457d0cad36bcbb0ee94ec3c3486014d HOSTS=amazon2-AARCH64a bundle exec rake ci:test:setup
...
❯ bundle exec beaker exec tests
... SNIP...
      - Host Configuration Summary -


              - Test Case Summary for suite 'tests' -
       Total Suite Time: 500.02 seconds
      Average Test Time: 2.96 seconds
              Attempted: 169
                 Passed: 147
                 Failed: 0
                Errored: 0
                Skipped: 22
                Pending: 0
                  Total: 169

      - Specific Test Case Status -
        
Failed Tests Cases:
Errored Tests Cases:
Skipped Tests Cases:
  Test Case tests/api/value/core_and_custom.rb 
  Test Case tests/api/value/core_and_custom_overwrite.rb 
  Test Case tests/api/value/core_fact.rb 
  Test Case tests/api/value/custom_fact_in_different_file.rb 
  Test Case tests/api/value/custom_fact_in_same_file_as_fact_name.rb 
  Test Case tests/api/value/env_fact.rb 
  Test Case tests/api/value/external_fact.rb 
  Test Case tests/api/value/non_existent_fact.rb 
  Test Case tests/custom_facts/expand_command.rb 
  Test Case tests/custom_facts/not_expand_command.rb 
  Test Case tests/custom_facts/using_win32ole_should_not_hang.rb 
  Test Case tests/custom_facts/windows_not_expand_command.rb 
  Test Case tests/facts/mountpoints_fact.rb 
  Test Case tests/facts/nim_type.rb 
  Test Case tests/facts/operatingsystem_detection_after_clear_on_ubuntu.rb 
  Test Case tests/facts/osx_numeric_hostname.rb 
  Test Case tests/facts/validate_file_system_size_bytes.rb 
  Test Case tests/facts/windows_os.rb 
  Test Case tests/options/config_file/ttls/cached_custom_group_core_custom_facts.rb 
  Test Case tests/options/config_file/ttls_cached_facts_that_are_empty_return_an_empty_value.rb 
  Test Case tests/options/config_file/ttls_external_facts_in_custom_groups.rb 
  Test Case tests/options/puppet_facts.rb 
Pending Tests Cases: