define cli/set _is_setter_property before usage

Author: gronke

iocage/cli/set.py

@@ -87,6 +87,10 @@ def cli(ctx, props, jail):
     exit(0)
 
 
+def _is_setter_property(property_string):
+    return "=" in property_string
+
+
 def set_properties(
     properties: typing.List[str],
     target: 'iocage.lib.LaunchableResource.LaunchableResource'
@@ -113,7 +117,3 @@ def set_properties(
         target.save()
 
     return updated_properties
-
-
-def _is_setter_property(property_string):
-    return "=" in property_string