lib/facter: FIX docker Facts

lib/facter/docker.rb

@@ -26,7 +26,7 @@ if $? == 0
             $docker_containers_stopped = line[/^\sStopped:\s*([0-9]*)/,1].strip
         end
         if (line[/^Images/])
-            $docker_containers_images = line[/^Images:\s*([0-9]*)/,1].strip
+            $docker_images = line[/^Images:\s*([0-9]*)/,1].strip
         end
         if (line[/^Server\sVersion/])
             $docker_version = line[/^Server\sVersion:\s*([0-9.]*)/,1].strip
@@ -64,6 +64,8 @@ if $? == 0
     end
 end
 
+$docker_compose_version=''
+
 $test_docker_compose=%x(which docker-compose 2>/dev/null)
 if $? == 0
     $docker_compose_info = %x(docker-compose version 2>/dev/null)