Align messages for "password" parameter

Use same general message if the "password" parameter is given for a FreeBSD target host whether the group exists yet or not
Make language clearer surrounding the default case

conf/type/__group/gencode-remote

@@ -79,8 +79,14 @@ else
             gid)
                proparg="-g"
                ;;
+            password)
+               echo "group/$name: FreeBSD doesn't support password setting" >&2
+               exit 1
+               ;;
             *)
-               echo "Unknown property: $property" >&2
+               # The type has been updated to support more properties than it knows how to handle for FreeBSD
+               # tell the user about this.
+               echo "Currently unknown property: $property" >&2
                exit 1
                ;;
          esac