Component/h5py: Add numpy as dependency of h5py

While testing this merge request : nexedi/erp5!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

/reviewed-on nexedi/slapos!267

component/h5py/buildout.cfg

@@ -2,6 +2,7 @@
 extends =
   ../hdf5/buildout.cfg
   ../cython/buildout.cfg
+  ../numpy/buildout.cfg
 parts =
   h5py
 
@@ -12,7 +13,9 @@ CPPFLAGS = -I${hdf5:location}/include
 [h5py]
 recipe = zc.recipe.egg:custom
 egg = h5py
-setup-eggs = ${cython:egg}
+setup-eggs = 
+  ${cython:egg}
+  ${numpy:egg}
 include-dirs =
   ${hdf5:location}/include
 library-dirs =