Replace cheyenne references with derecho throughout

bld/namelist_files/README.CHECKLIST.interpolating_initial_conditions.md

@@ -14,8 +14,8 @@ interpolate:
    file. Note that there may be other options (like carbon isotopes)
    that also need to be turned on. While doing this, generate
    baselines. e.g., run
-   `SMS_Ld1.f09_g17.I1850Clm50Sp.cheyenne_intel.clm-default` or
-   `SMS_Ld1.f09_g17.I1850Clm50BgcCrop.cheyenne_intel.clm-ciso`, with
+   `SMS_Ld1.f09_t232.I1850Clm50Sp.derecho_intel.clm-default` or
+   `SMS_Ld1.f09_t232.I1850Clm50BgcCrop.derecho_intel.clm-ciso`, with
    baseline generation.
 
    - Confirm that the test points to the desired, original finidat file,
@@ -32,7 +32,7 @@ interpolate:
    example:
 
    ```
-   ncatted -h -a Notes_190111,global,c,c,'Interpolated from clmi.I1850Clm50BgcCrop.1366-01-01.0.9x1.25_gx1v6_simyr1850_c171213.nc. This is the finidat_interp_dest.nc file from SMS_Ln1.f09_g17.I1850Clm50BgcCrop.cheyenne_intel, run from ctsm1.0.dev022. Updates from the previous file are: (1) uses gx1v7 rather than gx1v6; (2) many inactive points are absent.'
+   ncatted -h -a Notes_190111,global,c,c,'Interpolated from clmi.I1850Clm50BgcCrop.1366-01-01.0.9x1.25_gx1v6_simyr1850_c171213.nc. This is the finidat_interp_dest.nc file from SMS_Ln1.f09_g17.I1850Clm50BgcCrop.derecho_intel, run from ctsm1.0.dev022. Updates from the previous file are: (1) uses gx1v7 rather than gx1v6; (2) many inactive points are absent.'
    ```
 
 4. Using `ncdump -h`, diff the headers of the new and old files, and

cime_config/SystemTests/mksurfdataesmf.py

@@ -3,8 +3,8 @@
 and the CTSM completes a simulation with this fsurdat file.
 
 We test res = '10x15' because it uses a lower-res topography file instead of
-the 1-km topography raw dataset. The 1-km file causes the test to run out of
-memory on cheyenne.
+the 1-km topography raw dataset. During development on previous machine
+cheyenne we found that the 1-km file caused the test to run out of memory.
 
 Currently casper complains that `git -C` is not a valid option.
 I added -C to the `git describe` in gen_mksurfdata_namelist for this

cime_config/SystemTests/systemtest_utils.py

@@ -15,7 +15,6 @@ def cmds_to_setup_conda(caseroot):
     # a shell with a conda environment activated
     conda_setup_commands += "CONDA_PREFIX=; "
     # Execute the module unload/load when "which conda" fails
-    # eg on cheyenne
     try:
         subprocess.run("which conda", shell=True, check=True)
     except subprocess.CalledProcessError: