config validation rework and clean up Makefile templates

gstlal-inspiral/bin/gstlal_inspiral_set_svdbin_option

gstlal-inspiral/bin/gstlal_inspiral_workflow

gstlal-inspiral/python/config/inspiral.py

gstlal-inspiral/python/dags/layers/inspiral.py

...flows/templates/Makefile.offline_inspiral_filter_template

...rkflows/templates/Makefile.offline_inspiral_full_template

...ws/templates/Makefile.offline_inspiral_injection_template

...orkflows/templates/Makefile.offline_inspiral_psd_template

...flows/templates/Makefile.offline_inspiral_rerank_template

...orkflows/templates/Makefile.offline_inspiral_svd_template

gstlal/python/config/__init__.py