maint-1.2 not supported on Compy

@rljacob indicated that all maint tags should work on all supported systems. On compy using maint-1.2,

./create_newcase --case FC5AV1C-L_ne4_ne4_m1.2 --res ne4_ne4 --compset FC5AV1C-L --machine compy --compiler intel --project e3sm
Compset longname is 2000_CAM5%AV1C-L_CLM45%SPBC_CICE%PRES_DOCN%DOM_SROF_SGLC_SWAV
Compset specification file is /qfs/people/worl312/E3SM/MAINT/maint-1.2/E3SM/cime/../components/cam/cime_config/config_compsets.xml
Compset forcing is
Com forcing is present day:
ATM component is cam5 physics:CAM with complete set of E3SM atmospheric mods for V1 (72 layers model):CAM with complete set of E3SM atmospheric mods for V1 (72 layers model) and ACES4BGC SOAG emissions- v04p2:
LND component is clm4.5 physics:clm4.5 Satellite phenology:clm4.5 Satellite phenology with black carbon deposition:
ICE component is prescribed cice:
OCN component is DOCN prescribed ocean mode
ROF component is Stub river component
GLC component is Stub glacier (land ice) component
WAV component is Stub wave component
ESP component is
Pes specification file is /qfs/people/worl312/E3SM/MAINT/maint-1.2/E3SM/cime/config/e3sm/allactive/config_pesall.xml
ERROR: No machine compy found

In contrast,

- maint-1.0 builds and run this case, with full performance data archiving.
- maint-1.1 builds and runs this case, with full performance data archiving (though the default PE layout differs from maint-1.0 and there is no support for the short queue).