RFR 8043836: Need new tests for AES cipher

[FELIX YANG]

May I request you to review these 6 new tests to be added for AES cipher.
New tests are added to address following:

- Test AES for different modes and padding schemes
- Test AES encryption with no padding
- same buffer can be used for encrypt and decrypt with AES


JDK Issue: https://bugs.openjdk.java.net/browse/JDK-8043836
Webrev: http://cr.openjdk.java.net/~rhalade/8043836/webrev.00/

Thanks,