Description of problem:
The LiveCD installer can be invoked multiple times resulting in multiple
installations occurring simultaneously.

Version-Release number of selected component (if applicable):
F7LiveCDtest3

How reproducible:
Always

Steps to Reproduce:
1. Start livecd install by clicking the desktop icon
2. repeat this as many times as you like
  
Actual results:
Multiple instances of anaconda start

Expected results:
The original instance should be brought into focus and a new one prevented from
being started

Additional info:
While it is not a sane thing to do, if it is mistakenly done I don't think very
good things would happen. Therefore it should be prevented.