Make names of ini files and executables the same

applications/knl/poisson_dg/knl_poisson_dg.mini

-__name = app_knl_poisson_dg_{__exec_suffix}
+__name = app_knl_poisson_{__exec_suffix}
 __exec_suffix = deg{formcompiler.ufl_variants.degree}_{opcount_suffix}_level{formcompiler.instrumentation_level}
 
 opcount_suffix = opcount, nonopcount | expand opcount