Inconsistent diagnostic file suffix across parm/atm/obs/config yamls

[RussTreadon-NOAA]

Different yamls in parm/atm/obs/config use different suffixes for diagnostic files. As a result the finalize method in g-w atm_analysis.py fails to gzip and tar all diagnostic files. Currently the finalize method only processes diagnostic files ending in the suffix .nc4.

        # get list of diag files to put in tarball
        diags = glob.glob(os.path.join(self.task_config.DATA, 'diags', 'diag*nc4'))

The diagnostic suffixes used by yamls in parm/atm/obs/config are tabulated below

.nc	.nc4
atms_n20.yaml	aircraft.yaml
atms_npp.yaml	amsua_n19.yaml
conv_ps.yaml	cris-fsr_n20.yaml
iasi_metop-a.yaml	cris-fsr_npp.yaml
iasi_metop-b.yaml	gnssro.yaml
satwind_abi_goes-16.yaml	omi_aura.yaml
satwind_abi_goes-17.yaml	ompsnp_npp.yaml
satwind_seviri_m11.yaml	ompsnp_npp.yaml
satwind_seviri_m8.yaml	ompstc8_npp.yaml
scatwind_ascat_metop-a.yaml	satwind.yaml
scatwind_ascat_metop-b.yaml	satwind_ahi_h8.yaml
	sfc.yaml
	sfcship.yaml
	sondes.yaml
	ssmis_f17.yaml
	ssmis_f18.yaml

The NetCDF 4.92. FAQ recommends .nc

What convention should be used for the names of netCDF files?
NetCDF files should have the file name extension ".nc". The recommended extension for netCDF files was changed from ".cdf" to ".nc" in 1994 in order to avoid a clash with the NASA CDF file extension, and now it also avoids confusion with "Channel Definition Format" files.

[RussTreadon-NOAA]

Note: Closing this issue will also close GDASAPpp issue #735