network_page:fix always prompt "no changes, nothing to do." issue

Change-Id: Ib0a97d1d399c72258e85f47c7b9f636aa2a7ff60
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1003231
Signed-off-by: hadong <hadong0720@gmail.com>