Fix crash due to inappropriate unload of the HDF5 library
This patch fixes a segmentation fault that is caused by applications that load/unload HDF5, but when netcdf is unloaded (before the HDF5 unload) it has not unregistered the new class which is now not in memory. Adding a finalize call for the HTTP class fixes the crash.
Closes: #1058621 Thanks: John Donoghue for the patch Gbp-Dch: Full