Comment 1 for bug 1820341

after changing rabbitmq-server config to enable the plugin:

```
juju config rabbitmq-server management_plugin=true
```

After that, I see that the port (15672) is opened. In `juju status`, I can see `5672/tcp,15672/tcp`

When I try to access Web UI it says `Login failed`, and rabbitmq-server log shows:

```
=WARNING REPORT==== 15-Mar-2019::20:31:32 ===
HTTP access denied: user 'testui' - Not management user
```