Add skip function for IPv6Test tests

Skip_checks method should be called to check appropriate
parameters (include specific test parameters such as
ipv6_subnet_attributes) before run IPv6Test.

Related-PROD: PRODX-13041

Change-Id: I6e1a0c192a8e8ce62b7437d864f4f4f86563db79
(cherry picked from commit 4d74044f42a026415ed491cf0c72ea81e3278dcb)
1 file changed