Description of problem:

create a guest 'f17' with virt-manager, then edit with 
virsh edit f17, and add the following into the xml file.
<channel type='tcp'>
  <source mode='connect' host='127.0.0.1' service='6080'/>
  <target type='virtio' name='org.fedoraproject.anaconda.log.0'/>
</channel>

after save it and open the guest xml file, it does not exist.

Version-Release number of selected component (if applicable):
0.9.6

How reproducible:


Steps to Reproduce:
1. create a guest
2. edit with 'virsh edit <machine name>'
3. save the edit and exit
4. nothing changed
  
Actual results:


Expected results:


Additional info: