tests: Split ipv6 specific tests into a new test group

This way they can be easily disabled later on when IPv6 support is made
optional.

Change-Id: I3906dbf55ccf1650083398e08ac870add0bbdcef
diff --git a/tests/lib/in46a_v6_test.ok b/tests/lib/in46a_v6_test.ok
new file mode 100644
index 0000000..d092591
--- /dev/null
+++ b/tests/lib/in46a_v6_test.ok
@@ -0,0 +1,8 @@
+Testing in46a_to_af() with IPv6 addresses
+Testing in46a_to_sas() with IPv6 addresses
+Testing in46a_ntop() with IPv6 addresses
+res = 102:304:506:708:90a:b0c:d0e:f10
+Testing in46a_equal() with IPv6 addresses
+testing in46a_to_eua() with IPv6 addresses
+Testing in46a_from_eua() with IPv6 addresses
+Testing in46a_netmasklen() with IPv6 addresses