extract_namelist_defaults.py needs to work with programs as well as modules

[hkershaw-brown]

Programs can have executable lines before contains

extract_namelist_defaults.py is failing at line 86 ERROR: Error parsing '/Users/hkershaw/DART/Crocodile/cesm_interface/DART_interface/DART/models/cice/cice_to_dart.f90': at line 86

end do nc_check(nf90_close(ncid),'cice_to_dart','close'//trim(parameter_input_file))

DART programs have
call initialize_utilities
at (almost) the start of the executable statements.