avocado.plugins.lister: Get plugin docs with description attribute.

Signed-off-by: NRuda Moura <rmoura@redhat.com>

avocado/plugins/lister.py

@@ -50,5 +50,6 @@ class PluginsList(plugin.Plugin):
                 status = bcolors.healthy_str("Enabled")
             else:
                 status = bcolors.fail_header_str("Disabled")
-            pipe.write(format_str % (bcolors.header_str(plug.name), plug.__doc__.strip(),
+            pipe.write(format_str % (bcolors.header_str(plug.name),
+                                     plug.description,
                                      status))