ISSUE-451: [user.management.enable=false] - default user/password is not admin

[sijie]

Original Issue: apache#451

---

I've already seen the issue apache#347, which says it has been solved by apache#351 but that doesn't work.
The default user/password continues to not be an admin user.

If I have my application.properties as follows:

If user.management.enable is true, the following account and password will no longer be valid.

pulsar-manager.account=pulsar
pulsar-manager.password=pulsar

If true, the database is used for user management

user.management.enable=false

default environment configuration

default.environment.name=pulsar_local
default.environment.service_url=http://172.25.147.191:8080

And then login with pulsar/pulsar, the default environment configuration is not even loaded.
If I try to add a new environment, it says "User does not have permission to operate".

Please solve this issue.
I believe that maybe, it needs to be added "headers.add("role", "admin");" in LoginController when user.management.enable=false.

Thanks