BLD: update to h5py 2.8.0
BLD: update to h5py 2.8.0

This will let us use numpy 1.14 on the floor this cycle

NSLS-II/auto-build-tagged-recipes,NSLS-II/lightsource2-recipes,NSLS-II/lightsource2-recipes,NSLS-II/lightsource2-recipes,NSLS-II/auto-build-tagged-recipes,NSLS-II/lightsource2-recipes