if we install cupy with pip install cupy, instead of pip install cupy-cudaXXX, the package name is cupy

[k-okada]

as reporeted jsk-ros-pkg/jsk_visualization#809, Sometimes we need to run pip install cupy and compile cupy with installed cuda version. In this case we need to check project_name is cupy or cupy-cuda.

>>> [p for p in list(itertools.chain(*[pkg_resources.find_distributions(_) for _ in sys.path])) if "cupy" in p.project_name ]
[cupy 6.7.0 (/usr/local/lib/python2.7/dist-packages)]