Manually reinstating ai_min after test failure

[glemieux]

Reinstating ai_min that was removed in PR #733 as it appears to be causing test failures.

Description:

During testing of PR #734 and it's accompanying CTSM PR #1324 it was discovered that merging in fates tag sci.1.43.6_api.14.2.0 into the snow occlusion fates PR branch was causing failures on the following aux_clm tests:

SMS_D_Lm6.f45_f45_mg37.I2000Clm45Fates.cheyenne_intel.clm-FatesColdDef
SMS_D_Lm6.f45_f45_mg37.I2000Clm50Fates.cheyenne_intel.clm-FatesColdDef
SMS_D_Lm6_P144x1.f45_f45_mg37.I2000Clm50Fates.cheyenne_intel.clm-FatesColdDef

Collaborators:

@rgknox @ekluzek @billsacks

Expectation of Answer Changes:

This will change answers relative to the last tag.

Checklist:

• My change requires a change to the documentation.
• I have updated the in-code documentation .AND. (the technical note .OR. the wiki) accordingly.
• I have read the CONTRIBUTING document.
• FATES PASS/FAIL regression tests were run
• If answers were expected to change, evaluation was performed and provided

Test Results:

All the above tests pass now when merged into #734.

Testing of fates and aux_clm suite without #734 in progress.

CTSM (or) E3SM (specify which) test hash-tag:
See below for regression test details

CTSM (or) E3SM (specify which) baseline hash-tag:
See below for regression test details

FATES baseline hash-tag:
See below for regression test details

Test Output:
ctsm5.1.dev033 merged into pr branch and this pr branch merged onto #734:
SMS_D_Lm6.f45_f45_mg37.I2000Clm50Fates.cheyenne_intel.clm-FatesColdDef:
/glade/u/home/glemieux/scratch/tests_0416-103437ch

SMS_D_Lm6.f45_f45_mg37.I2000Clm50Fates.cheyenne_intel.clm-FatesColdDef:
/glade/u/home/glemieux/scratch/tests_0416-162804ch

SMS_D_Lm6_P144x1.f45_f45_mg37.I2000Clm50Fates.cheyenne_intel.clm-FatesColdDef:
/glade/u/home/glemieux/scratch/tests_0416-162822ch

See below for regression test details

[glemieux]

I ran fates test suite baseline comparison against fates-sci.1.44.0_api.14.2.0-ctsm5.1.dev025-C2094348b-F74433f48 and generated new baselines for this branch using ctsm5.1.dev033: /glade/u/home/glemieux/scratch/tests_0416-134459ch. All expected tests PASS although not all b4b (which is not unexpected).