How to add user, remove user and change password in fabric

Issue

Below steps are followed to create a fabric.
- Install Red Hat JBoss Fuse 6.1.0.
- Start it by executing ./fuse script
- Create fabric
```
fabric:create --clean --new-user admin --new-user-password admin8 --zookeeper-password ZooPass --wait-for-provisioning
```
It will create fabric with user admin and password admin8.
After fabric is created, is it possible to add more users or delete users, or change password for existing user?

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