Changes to get snow DA test working (#875)

This is to get the first snow DA global-workflow test working.
Subsequent PRs will be needed when the test is updated but this gets a
test started.

parm/land/prep/prep_ims.yaml

@@ -1,10 +1,10 @@
 calcfims:
   mkdir:
-    - $(DATA)/obs
+    - {{ DATA }}/obs
   copy:
-    - [$(COM_OBS)/$(OPREFIX)ims{{ current_cycle | to_julian }}_4km_v1.3.nc, $(DATA)/obs/ims{{ current_cycle | to_julian }}_4km_v1.3.nc]
-    - [$(COM_OBS)/$(OPREFIX)IMS4km_to_FV3_mapping.$(CASE)_oro_data.nc, $(DATA)/obs/IMS4km_to_FV3_mapping.$(CASE)_oro_data.nc]
+    - [{{ COM_OBS }}/{{ OPREFIX }}ims{{ current_cycle | to_julian }}_4km_v1.3.nc, {{ DATA }}/obs/ims{{ current_cycle | to_julian }}_4km_v1.3.nc]
+    - [{{ COM_OBS }}/{{ OPREFIX }}IMS4km_to_FV3_mapping.{{ CASE }}_oro_data.nc, {{ DATA }}/obs/IMS4km_to_FV3_mapping.{{ CASE }}_oro_data.nc]
 ims2ioda:
   copy:
-    - [$(DATA)/ims_snow_{{ current_cycle | to_YMDH }}.nc4, $(DATA)/obs/$(OPREFIX)ims_snow.nc4]
+    - [{{ DATA }}/ims_snow_{{ current_cycle | to_YMDH }}.nc4, {{ COM_OBS }}/{{ OPREFIX }}ims_snow.nc4]