ISPN-4023 RESTCertSecurityTest.testSecuredReadWriteOperations random fai...

...lures

https://issues.jboss.org/browse/ISPN-4023

* The main problem was that copying resources with "filtering" enabled was tampering the keystores. So I removed the filtering for keystore/truststore files.
* Further clean up

The test is constantly passing for me now.