Component/h5py: Add numpy as dependency of h5py

While testing this merge request : https://lab.nexedi.com/nexedi/erp5/merge_requests/243

The following test was failing for me : https://nexedi.erp5.net/test_result_module/20180107-664D9A6/13

Since numpy is not added as a dependecy for h5py. the testnode didn't upgraded numpy while upgrading h5py. Adding numpy as a dependency should fix it