Add :: symbol to read from nems.configure. Required for ESMF 8bs20+.

[rsdunlapiv]

This small change is required to update UFS to ESMF8bs20+. This is due to an update in the NUOPC layer. The change is backward compatible, so this can be tested with the current version of ESMF under UFS, which is ESMF8bs14.

[rsdunlapiv]

@danrosen25

[danrosen25]

@rsdunlapiv The hpc-stack on hera does not have a build for esmf/8_2_0_beta_snapshot_20+. What are your recommendations?

[rsdunlapiv]

@danrosen25 please see here for general instructions for testing UFS with ESMF beta snapshots, thanks to @aerorahul:
https://github.com/esmf-org/esmf-test-scripts/tree/main/ufs

I have a build of ESMF 8bs20 here:
setenv ESMFMKFILE /scratch2/NCEPDEV/stmp1/Rocky.Dunlap/esmftest/ESMF-INSTALL/intel-18.0.5.274/impi-2018.0.4/esmf/8_2_0_beta_snapshot_20/lib/esmf.mk

[danrosen25]

I tested these changes on Hera with
esmf/8_2_0_beta_snapshot_14
esmf/8_2_0_beta_snapshot_20
results were bit-for-bit and the HYCOM cap is correctly picking up the custom import and export fields.

[danrosen25]

@BinLiu-NOAA, @junwang-noaa
Who maintains the NOAA-EMC/HYCOM-src repository? The ESMF team has a cap fix needed for the ESMF 8.2.0 release. I've already tested it and it is both backwards compatible and fixes the issue.

[junwang-noaa]

@danrosen25 So far, Bin and I are the code managers. Would you please make a ufs-weather-model PR that uses this https://github.com/rsdunlapiv/HYCOM-src/tree/fix_imp_exp_read branch? This way ufs-weather-model will use the latest hycom cap. Thanks

[danrosen25]

@rsdunlapiv
Do you already have a fork of https://github.com/ufs-community/ufs-weather-model/tree/develop that updates HYCOM to https://github.com/rsdunlapiv/HYCOM-src/tree/fix_imp_exp_read?

[junwang-noaa]

@danrosen25 if the changes in this PR are backward compatible, can you commit the code? We will update the revision in ufs-weather-model in the PR of updating ESMF to public release 8.2.0. Thanks