Follow-up changes for PR https://github.com/NCAR/ccpp-framework/pull/307

[climbfuji]

The following changes were suggested during the code review of PR #307.

scripts/ccpp_prebuild.py, line 381

-                if type(optional_arguments[module_name][subroutine_name]) is list:
+                if isinstance(optional_arguments[module_name][subroutine_name], list):

scripts/conversion_tools/unit_conversion.py, line 116

-    return '{var}/1.0E+3{kind}'
+    return '{var}*1.0E-3{kind}'

scripts/mkcap.py, line 94

-        if not type(value) is list:
+        if not isinstance(value, list):

scripts/mkcap.py, line 173

-        if type(values)==dict:
+        if isinstance(values, dict):

[climbfuji]

Fixed in #311.