resgroup: add test cases for name convention.
resgroup names follow the general object name convntion, and there are 3
reserved names:
default_group, admin_group: names for the two default resgroups;
none: special name used in ALTER ROLE to reset to the proper default
resgroup;
@@ -4,6 +4,7 @@ test: resgroup/enable_resgroup
# basic syntax
test: resgroup/resgroup_syntax
test: resgroup/resgroup_transaction
+test: resgroup/resgroup_name_convention
# functions
test: resgroup/resgroup_concurrency
