PCU: add IPv6 support for SNS

With PCUIF 10 the remote can be IPv4 or IPv6.
Add all missing parts including SNS IPv6 elements,
the support to omit IPv4 elements and a PCU_Tests_SNSv6.cfg
configuration to run all tests with IPv6

Change-Id: I43d64caca600fff78f3fbbb3e8179f447f235d46
diff --git a/pcu/PCU_Tests_SNS.cfg b/pcu/PCU_Tests_SNS.cfg
index 50f6129..6a64626 100644
--- a/pcu/PCU_Tests_SNS.cfg
+++ b/pcu/PCU_Tests_SNS.cfg
@@ -20,6 +20,7 @@
 	nsvci := 1234,
 	nsei := 1234
 }
+PCUIF_Types.mp_pcuif_version := 10
 
 [TESTPORT_PARAMETERS]