Turn IAU off during staging job for cold start experiments (#3215)

Resolve a bug related to IAU when cold-starting an experiment.

The model start time for non-atmos ICs were incorrectly being reduced by 3hrs
for cold-started experiments. While a user may want IAU on (`DOIAU=YES`), the
IAU switch should be set to "NO" for the staging job when it is cold-started.

Resolves #2890
Resolves #2865

parm/config/gefs/config.stage_ic

@@ -14,6 +14,10 @@ export STAGE_IC_YAML_TMPL="${PARMgfs}/stage/master_gefs.yaml.j2"
 
 source "${HOMEgfs}/versions/ic.ver"
 
+if [[ ${EXP_WARM_START} = ".false." ]] ; then
+  export DOIAU="NO"        # Turn off for staging
+fi
+
 # Set ICSDIR (if not defined)
 if [[ -z "${ICSDIR}" ]] ; then
 

parm/config/gfs/config.stage_ic

@@ -14,6 +14,10 @@ export STAGE_IC_YAML_TMPL="${PARMgfs}/stage/master_gfs.yaml.j2"
 
 source "${HOMEgfs}/versions/ic.ver"
 
+if [[ ${EXP_WARM_START} = ".false." ]] ; then
+  export DOIAU="NO"        # Turn off for staging
+fi
+
 # Set ICSDIR (if not defined)
 if [[ -z "${ICSDIR}" ]] ; then