Use absolute imports in test_fb303
Use absolute imports in test_fb303

If we add tests in tests/thrift, this will conflict otherwise

fmoo/sparts,pshuff/sparts,pshuff/sparts,facebook/sparts,bboozzoo/sparts,bboozzoo/sparts,fmoo/sparts,facebook/sparts,djipko/sparts,djipko/sparts