Add py-setuptools as dependency

With the addition of dependency types and with `py-setuptools` set as
type='build' there are more packages that need to have `py-setuptools`
added as a dependency.

This PR adds that dependency for the following packages:
- py-h5py
- py-networkx
- py-pytables
- py-scikit-image

var/spack/repos/builtin/packages/py-h5py/package.py

@@ -43,6 +43,7 @@ class PyH5py(Package):
     # Build dependencies
     depends_on('py-cython@0.19:', type='build')
     depends_on('pkg-config', type='build')
+    depends_on('py-setuptools', type='build')
     depends_on('hdf5@1.8.4:')
     depends_on('hdf5+mpi', when='+mpi')
     depends_on('mpi', when='+mpi')