reduce hash iterations from 2 million to 210k iterations, in order to…

… be faster on login and safe enough

issue #58

gamertrack-domain/src/main/java/com/gepardec/security/JwtUtil.java

@@ -54,7 +54,7 @@ public Map<String, String> calcHashedCredentialMap(String clearTextPassword) {
     }
 
     private String hashAndSaltPassword(String clearTextPassword, ByteSource salt) {
-        return new Sha512Hash(clearTextPassword, salt, 2000000).toHex();
+        return new Sha512Hash(clearTextPassword, salt, 210000).toHex();
     }
 
     private ByteSource getSalt() {