Very High Logging Level In XMLCipher

[Vishal Mahajan]

The XMLCipher.loadEncryptedKey(Document, Element) has a very high 
logging level. If the _cipherMode is not in UNWRAP_MODE or DECRYPT_MODE 
an error is logged, something like:

   "XMLCipher unexpectedly not in UNWRAP_MODE or DECRYPT_MODE..."

I think this is not OK as loadEncryptedKey() is a like a factory method 
for generating EncryptedKey instances. This log should probably be 
removed from the code.

Thanks,

Vishal