Replace nems cpl validation

Removes the old cpl validation script since the nemsconfigure string
is no longer used and replaces it with a check whether the specified
template file is readable.

Refs NOAA-EMC#1692

parm/config/gefs/config.ufs

@@ -487,4 +487,9 @@ case "${model_list}" in
     ;;
 esac
 
+if [[ ! -r ${ufs_configure_template} ]]; then
+  echo "FATAL ERROR: ${ufs_configure_template} either doesn't exist or is not readable."
+  exit 17
+fi
+
 echo "END: config.ufs"

parm/config/gfs/config.ufs

@@ -507,4 +507,9 @@ case "${model_list}" in
     ;;
 esac
 
+if [[ ! -r ${ufs_configure_template} ]]; then
+  echo "FATAL ERROR: ${ufs_configure_template} either doesn't exist or is not readable."
+  exit 17
+fi
+
 echo "END: config.ufs"

scripts/exglobal_forecast.sh

@@ -80,16 +80,12 @@
 source "${HOMEgfs}/ush/preamble.sh"
 
 # include all subroutines. Executions later.
-source "${HOMEgfs}/ush/cplvalidate.sh"	# validation of cpl*
 source "${HOMEgfs}/ush/forecast_predet.sh"	# include functions for variable definition
 source "${HOMEgfs}/ush/forecast_det.sh"  # include functions for run type determination
 source "${HOMEgfs}/ush/forecast_postdet.sh"	# include functions for variables after run type determination
 source "${HOMEgfs}/ush/nems_configure.sh"	# include functions for nems_configure processing
 source "${HOMEgfs}/ush/parsing_model_configure_FV3.sh"
 
-# Compset string. For nems.configure.* template selection. Default ATM only
-confignamevarfornems=${confignamevarfornems:-'atm'}
-
 # Coupling control switches, for coupling purpose, off by default
 cpl=${cpl:-.false.}
 cplflx=${cplflx:-.false.} # default off,import from outside source
@@ -104,10 +100,6 @@ ICETIM=${DELTIM}
 CPL_SLOW=${CPL_SLOW:-${OCNTIM}}
 CPL_FAST=${CPL_FAST:-${ICETIM}}
 
-echo "MAIN: Validating '${confignamevarfornems}' with cpl switches"
-cplvalidate
-echo "MAIN: '${confignamevarfornems}' validated, continue"
-
 echo "MAIN: Loading common variables before determination of run type"
 common_predet