add vls failed ut
add vls failed ut

Change-Id: If5c921351047c7ddcf100ecfca5ca7526dfe1c25
Signed-off-by: ppleo <7ad112ae1b6efdd5da50ec5f4dd143639d87b1e4@zte.com.cn>

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