Re-build test data using Vault 0.11

In preparations for 1.0 compatibility and some later features the test
data generated with 0.5 becomes more of a problem without intermediate
updates, so it is now rebuilt from scratch.

As part of this change the unseal key is now split in 3 parts with a
threshold of 2 instead of the former 1/1,

src/test/resources/data_dir/sys/token/_salt

@@ -1 +1 @@
-{"Key":"sys/token/salt","Value":"AAAAAQIHNULiDBunAxcG4lQlnKj21ShIgxm7GNc7Zf8an238P2F4XryORfdzXqPyehkJ/npBnI5rCMmt8xLymOXLFRnB"}
+{"Value":"AAAAAQJwWbbayyTIlVnbstZPr/otfBY+N+m0j1+7GL19VJXozOVz5jWHqHG6go7ZJOhH2xopMPx3ON4a8kcXuaKU3sUD"}