修改vna登录返回xml结构（v5.0.3.0）
产品测试方案增加channel不为NULL时，极限值必须定义（camelv5.0.3.0）
new pull v5.0.0.3
new pull commit 5.0.3.0
Merge branch 'v5.0.3.0'
Conflicts:
	application/controllers/packing.php
	application/controllers/producttestcase.php
	application/views/templates/login1.tpl
	application/views/templates/producttestcase.tpl