Use https:// in datadog-reports.yaml (DataDog#503)

Author: Scott Cabrinha

spec/classes/datadog_agent_reports_spec.rb

@@ -172,7 +172,7 @@
         should contain_file(conf_file)\
           .with_owner('puppet')\
           .with_group('root')\
-          .with_content(/:api_url: api.datadoghq.eu/)
+          .with_content(/:api_url: https:\/\/api.datadoghq.eu/)
       end
       it { should contain_file(conf_file).without_content(/hostname_extraction_regex:/)  }
     end

templates/datadog-reports.yaml.erb

@@ -2,7 +2,7 @@
 
 ---
 :datadog_api_key: '<%= @api_key %>'
-:api_url: api.<%= @datadog_site %>
+:api_url: https://api.<%= @datadog_site %>
 <% if @hostname_extraction_regex -%>
 :hostname_extraction_regex: '<%= @hostname_extraction_regex %>'
 <% end -%>