Make BfPixelBufferTest run against a remote server.

This PR removes code from BfPixelBufferTest that makes the test look for files in a local binary repository. This breaks the test when executing the ``integration`` target on a local system with ICE_CONFIG pointing to a remote server.

This PR doesn't break any test methods. To verify it's validity, check the http://hudson.openmicroscopy.org.uk/view/2.%20Stable/job/OmeroJava-integration-stable/ job.

Also one can try setting ``omero.host`` to howe.openmicroscopy.org.uk, ``omero.user`` to user-1 and ``omero.pass`` to the usual and run the test with:
    
    ./build.py -f components/tools/OmeroJava/build.xml test -DTEST=integration/BfPixelBufferTest