test: earse license after cli ct test

lib-ee/emqx_license/test/emqx_license_cli_SUITE.erl

@@ -24,10 +24,15 @@ end_per_suite(_) ->
     ok.
 
 init_per_testcase(_Case, Config) ->
+    ok = persistent_term:put(
+        emqx_license_test_pubkey,
+        emqx_license_test_lib:public_key_pem()
+    ),
     {ok, _} = emqx_cluster_rpc:start_link(node(), emqx_cluster_rpc, 1000),
     Config.
 
 end_per_testcase(_Case, _Config) ->
+    persistent_term:erase(emqx_license_test_pubkey),
     ok.
 
 set_special_configs(emqx_license) ->
@@ -55,10 +60,6 @@ t_update(_Config) ->
     _ = emqx_license_cli:license(["update", "Invalid License Value"]).
 
 t_conf_update(_Config) ->
-    ok = persistent_term:put(
-        emqx_license_test_pubkey,
-        emqx_license_test_lib:public_key_pem()
-    ),
     LicenseKey = emqx_license_test_lib:make_license(#{max_connections => "123"}),
     Conf = #{
         <<"connection_high_watermark">> => <<"50%">>,