examples package inside core test classes

[Tommaso Teofili]

Hi all,
I'm creating a small set of tests for the hama-examples package and I
noticed that there are 3 classes under
core/src/test/java/org/apache/hama/examples.
The only one actually used seems to be ClassSerializePrinting which is used
in TestBSPMasterGroomServer so I'm proposing to move the other two ones
under hama-examples.
What do you think?
Tommaso