Remove use of DIN_LOC_ROOT_CLMFORC and use softlinks when needed for multiple disks for inputdata

[ekluzek]

We want to deprecate and remove DIN_LOC_ROOT_CLMFORC in CESM and use softlinks for cases where inputdata needs to reside on multiple disks.

The parent issue for this is in cime here:

ESMCI/cime#3097

[ekluzek]

There aren't too many definitions of this that would need to be removed. This is the primary usage of it, once removed completely here, it can be removed from the other places.

datm/cime_config/stream_definition_datm.xml:      <meshfile>$DIN_LOC_ROOT_CLMFORC/atm_forcing.datm7.GSWP3.0.5d.v1.c170516/clmforc.GSWP3.c2011.0.5x0.5.TPQWL.SCRIP.210520_ESMFmesh.nc</meshfile>
datm/cime_config/stream_definition_datm.xml:      <file first_year="1901" last_year="2014">$DIN_LOC_ROOT_CLMFORC/atm_forcing.datm7.GSWP3.0.5d.v1.c170516/Solar/clmforc.GSWP3.c2011.0.5x0.5.Solr.%ym.nc</file>
datm/cime_config/stream_definition_datm.xml:      <meshfile>$DIN_LOC_ROOT_CLMFORC/atm_forcing.datm7.GSWP3.0.5d.v1.c170516/clmforc.GSWP3.c2011.0.5x0.5.TPQWL.SCRIP.210520_ESMFmesh.nc</meshfile>
datm/cime_config/stream_definition_datm.xml:      <file first_year="1901" last_year="2014">$DIN_LOC_ROOT_CLMFORC/atm_forcing.datm7.GSWP3.0.5d.v1.c170516/Precip/clmforc.GSWP3.c2011.0.5x0.5.Prec.%ym.nc</file>
datm/cime_config/stream_definition_datm.xml:      <meshfile>$DIN_LOC_ROOT_CLMFORC/atm_forcing.datm7.GSWP3.0.5d.v1.c170516/clmforc.GSWP3.c2011.0.5x0.5.TPQWL.SCRIP.210520_ESMFmesh.nc</meshfile>
datm/cime_config/stream_definition_datm.xml:      <file first_year="1901" last_year="2014">$DIN_LOC_ROOT_CLMFORC/atm_forcing.datm7.GSWP3.0.5d.v1.c170516/TPHWL/clmforc.GSWP3.c2011.0.5x0.5.TPQWL.%ym.nc</file>
datm/cime_config/stream_definition_datm.xml:      <file first_year="1901" last_year="2016">$DIN_LOC_ROOT_CLMFORC/atm_forcing.datm7.cruncep_qianFill.0.5d.v7.c160715/Solar6Hrly/clmforc.cruncep.V7.c2016.0.5d.Solr.%ym.nc</file>
datm/cime_config/stream_definition_datm.xml:      <file first_year="1901" last_year="2016">$DIN_LOC_ROOT_CLMFORC/atm_forcing.datm7.cruncep_qianFill.0.5d.v7.c160715/Precip6Hrly/clmforc.cruncep.V7.c2016.0.5d.Prec.%ym.nc</file>
datm/cime_config/stream_definition_datm.xml:      <file first_year="1901" last_year="2016">$DIN_LOC_ROOT_CLMFORC/atm_forcing.datm7.cruncep_qianFill.0.5d.v7.c160715/TPHWL6Hrly/clmforc.cruncep.V7.c2016.0.5d.TPQWL.%ym.nc</file>
datm/cime_config/stream_definition_datm.xml:      <file first_year="$DATM_YR_START" last_year="$DATM_YR_END">$DIN_LOC_ROOT_CLMFORC/$CLM_USRDAT_NAME/CLM1PT_data/%ym.nc</file>