[Vysper] Default server startup, Admins and passwords

[Bernd Fondermann]

Hi,

I think it's bad to release a server with default passwords exposed at 
default installation.

That's why I changed the default startup classes (Spring-based and 
plain-standalone) to generate random passwords when the account is first 
created. If the account is persisted, no new password is generated on 
server restarts.

With changing passwords through service administration at our 
fingertips, I think we now live in a better (and more secure) world.

  Bernd