Remove KEEPDATA from config.base.nco.static

- NCO requested that KEEPDATA be removed from config.base and config.fcst since
KEEPDATA gets set at the ecflow level and shouldn't be changed by the configs lower down.
- Already commented out in config.fcst in prior commit.
- Removed KEEPDATA from config.base.nco.static since it becomes config.base
in prod mode with ecflow.
- Retaining KEEPDATA in config.base.emc.dyn since that only becomes config.base
in dev mode (rocoto doesn't set KEEPDATA).

Refs: #1,#238

parm/config/config.base.nco.static

@@ -74,7 +74,6 @@ export NCP="/bin/cp -p"
 export NMV="/bin/mv"
 export NLN="/bin/ln -sf"
 export VERBOSE="YES"
-export KEEPDATA="NO"
 export CHGRP_CMD="chgrp rstprod"
 export NEMSIOGET="$HOMEgfs/exec/nemsio_get"
 export NCDUMP="$NETCDF/bin/ncdump"