Make VaultProvider use API version 1

The vault driver lib has a issue with vault resource pathing ref:
BetterCloud/vault-java-driver#189
Forcing use of version 1, which is the version on the resources nada-kafka-conenct uses atm, seems to solve the issue.

Author: sonhal

src/main/java/no/nav/kafkaconnect/vault/VaultUtil.java

@@ -64,6 +64,7 @@ private void init() throws VaultError {
         VaultConfig vaultConfig = null;
         try {
             vaultConfig = new VaultConfig()
+                    .engineVersion(1)
                     .address(getPropertyOrDefault("VAULT_ADDR", "https://vault.adeo.no"))
                     .token(getVaultToken())
                     .openTimeout(5)