Add acceptance tests for rabbitmq_parameter
user
```ruby
require 'spec_helper_acceptance'

describe 'rabbitmq parameter on a vhost:' do

  context "create parameter resource" do
    it 'should run successfully' do
      pp = <<-EOS
      if $::osfamily == 'RedHat' {
        class { 'erlang': epel_enable => true }
        Class['erlang'] -> Class['::rabbitmq']
      }
      class { '::rabbitmq':
        service_manage    => true,
        port              => '5672',
        delete_guest_user => true,
        admin_enable      => true,
      }

      rabbitmq_plugin { [ 'rabbitmq_federation_management', 'rabbitmq_federation' ]:
        ensure => present
      } ~> Service['rabbitmq-server']

      rabbitmq_vhost { 'fedhost':
        ensure => present,
      } ->

      rabbitmq_parameter { 'documentumFed@fedhost':
        component_name => 'federation-upstream',
        value          => {
          'uri'    => 'amqp://server',
          'expires' => '3600000',
        },
      }
      EOS

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

    it 'should have the parameter' do
      shell('rabbitmqctl list_parameters -p fedhost') do |r|
        expect(r.stdout).to match(/federation-upstream.*documentumFed.*expires.*3600000/)
        expect(r.exit_code).to be_zero
      end
    end

  end
end
```
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