izumi_intel and izumi_gnu mpi-serial tests fail to build -- let's remove them

[ekluzek]

The following tests fail in the "mizu" test-suite on Izumi.

ERI_Mmpi-serial.5x5_amazon_r05.I2000Clm60SpMizGs.izumi_gnu.mizuroute-default    ( MODEL_BUILD)
PET_Mmpi-serial_P1x25.5x5_amazon_r05.I2000Clm60SpMizGs.izumi_intel.mizuroute-default    (SHAREDLIB_BUILD )
SMS_D_Mmpi-serial.5x5_amazon_r05.I2000Clm60SpMizGs.izumi_gnu.mizuroute-default  ( MODEL_BUILD)
SMS_D_Mmpi-serial.5x5_amazon_r05.I2000Clm60SpMizGs.izumi_intel.mizuroute-default        (SHAREDLIB_BUILD )

We removed izumi_gnu and izumi_intel tests for CTSM already, so rather than debug this, I think we should just remove them from the testlist. They could be moved to izumi_nag if it makes sense.

[ekluzek]

This is in v3.1.1 in ctsm5.4.044