Update filedata example for Accumulo 3.x development line

[jmark99]

The filedata example currently references code that no longer exists in the 3.x line of Accumulo. Update the example to work with the current line of development.

Three files have been temporarily commented out in order to allow the examples project to build successfully. These should be updated to allow the example to once again work properly.

[ctubbsii]

re #108