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/core/_audit

@@ -1 +1 @@
-{"Key":"core/audit","Value":"AAAAAQI4CkDWnI49wp9iDaEMhEgTyBBtXOuIcrn7m4qifUOwQ6reTf3BKc5IQXuhxN5h51KVeinMklz3Ld0Qgw=="}
+{"Value":"AAAAAQI695zhv1Tv/6m1Fx/L62lITd+ZWCi+xCDHkev2YtCSIDPrZgNzYnrCHG3cUjBePZt6NYUSgzvZTXbxZPN4rK2rPj/BN9xj9v1vH1woOMY6lNPmBR7r"}