Programmatically assigning user name when using UsernameToken

[Bai Shen]

The axis2.xml file contains a user name.  But I don't want to have to change
the xml file every time I want to change users.  I found that you can set
the user name in the PWCallbackHandler, but is there a better way to do it?
It just seems wrong to set it in the PWCallbackHandler.