added xvfb service and dependency to it for tests
added xvfb service and dependency to it for tests

digcat/puppet-alfresco,marsbard/puppet-alfresco,digcat/puppet-alfresco,digcat/puppet-alfresco,marsbard/puppet-alfresco,marsbard/puppet-alfresco,marsbard/puppet-alfresco,digcat/puppet-alfresco,digcat/puppet-alfresco,marsbard/puppet-alfresco