[fix] root was a member, not admin of every group from this

https://github.com/mykabam/kabam-kernel/blob/master/models/userModel.js#L384

```
 UserSchema.methods.hasRole = function (roleName) {
    if (this.root) {
      return true;
    } else {
      return (this.roles.indexOf(roleName) !== -1);
    }
  };
```