Fix OPENIG-361 introduced NPE issue with default `capture` decorator

git-svn-id: https://svn.forgerock.org/openig/trunk@701 dbb9e58e-28e6-4ce0-90e8-f11d9605b710
CR-5263 OpenIG-128 Change default cipher algorithm used in CryptoHeaderFilter
- Changed the default cipher algorithm from "DES/ECB/NoPadding" to "AES/ECB/PKCS5Padding".
- Modified/added unit tests according to the new selected default cipher.
- Updated javadoc.

git-svn-id: https://svn.forgerock.org/openig/trunk@702 dbb9e58e-28e6-4ce0-90e8-f11d9605b710