Error message could be in simpler English for incorrect syntax in test names

[slevis-lmwg]

./create_test SMS_L10d_D_Mmpi-serial.CLM_USRDAT.I1PtClm51Bgc.izumi_nag.clm-default--clm-NEON-NIWO
gave me this error:

Finished XML for test SMS_L10d_D_Mmpi-serial.CLM_USRDAT.I1PtClm51Bgc.izumi_nag.clm-default--clm-NEON-NIWO in 0.232909 seconds (FAIL). [COMPLETED 1 of 1]
    Case dir: /scratch/cluster/slevis/SMS_L10d_D_Mmpi-serial.CLM_USRDAT.I1PtClm51Bgc.izumi_nag.clm-default--clm-NEON-NIWO.20230627_133512_wvaqn7
    Errors were:
        Test 'SMS_L10d_D_Mmpi-serial.CLM_USRDAT.I1PtClm51Bgc.izumi_nag.clm-default--clm-NEON-NIWO' failed in phase 'XML' with exception ''NoneType' object has no attribute 'group''
          File "/fs/cgd/data0/slevis/git/add_xs_ground_ice_pr1787/cime/CIME/test_scheduler.py", line 1093, in _run_catch_exceptions
            return run(test)
          File "/fs/cgd/data0/slevis/git/add_xs_ground_ice_pr1787/cime/CIME/test_scheduler.py", line 885, in _xml_phase
            opt = match.group(1)

For the test to work, @ekluzek and I discovered that we needed to replace L10d with Ld10 in the test name.

Relates to ESCOMP/CTSM#2043

[ekluzek]

The part of the code is here:

                elif opt.startswith("L"):
                    match = re.match("L([A-Za-z])([0-9]*)", opt)
                    stop_option = {
                        "y": "nyears",
                        "m": "nmonths",
                        "d": "ndays",
                        "h": "nhours",
                        "s": "nseconds",
                        "n": "nsteps",
                    }
                    opt = match.group(1)

What should happen is that match should be queried to ensure it's a valid match. If it isn't it should return a sensible error to explain what went wrong. This same sort of thing should be added to other such matches for test types. This would allow the user to debug the problem on their own, rather than having to struggle to figure it out.

An interesting thing here is that the above actually worked for me even though it probably shouldn't have. So a better error check would be better for everyone.

[github-actions]

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