Add an acceptance test to prove that default encoding is wrong on Debian
user
```ruby
require 'spec_helper_acceptance'

# These tests are designed to ensure that the module, when ran with defaults,
# sets up everything correctly and allows us to connect to Postgres.
describe 'postgres::server', :unless => UNSUPPORTED_PLATFORMS.include?(fact('osfamily')) do
  it 'with defaults' do
    pp = <<-EOS
      class { 'postgresql::globals':
        encoding => 'UTF8',
        locale   => 'en_NG',
      } ->
      class { 'postgresql::server': }
    EOS

    apply_manifest(pp, :catch_failures => true)
    apply_manifest(pp, :catch_changes => true)
  end

  describe port(5432) do
    it { is_expected.to be_listening }
  end

  it 'can connect with psql' do
    psql('--command="\l" postgres', 'postgres') do |r|
      expect(r.stdout).to match(/List of databases/)
    end
  end

  it 'must set UTF8 as template1 encoding' do
    psql('--command="SELECT pg_encoding_to_char(encoding) FROM pg_database WHERE datname=\'template1\'"') do |r|
      expect(r.stdout).to match(/UTF8/)
    end
  end
end



```
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