Three elytron tests started to fail on JDK17

The following three tests started to fail on JDK16 & JDK17:

 - KeyStoresTestCase

 - CertificateAuthoritiesTestCase

 - AuthenticationClientTestCase

The problem appeared after recent Elytron related commits.

Steps to reproduce:

1) build wildfly-core with JDK8 - mvn clean install -DallTests -DskipTests=true

2) change directory to elytron maven submodule - cd elytron

3) change java to JDK17

4) run test, e.g.  - mvn clean test -Dtest=**/KeyStoresTestCase