NFVO-53 fix delete ns for safe
NFVO-53 fix delete ns for safe

Change-Id: Ie896bfee927d5aa1468d71865c33b791738fca33
Signed-off-by: fujinhua <302f4934d283b6f50163b4a7fd9b6c869e0ad64e@zte.com.cn>

open-o/nfvo,open-o/nfvo,open-o/nfvo,open-o/nfvo,open-o/nfvo