Created attachment 1017888 [details]
Domain config example

Description of problem:
After update to the latest versions (can't say exactly version when it started, but for now it is 1.2.14) on all my servers I started to experience following situation: if I edit domain configuration (even increase or decrease RAM by 1kb) and exit editor, libvirt throws following error:
```
error: XML document failed to validate against schema: Unable to validate doc against /usr/share/libvirt/schemas/domain.rng
Extra element devices in interleave
Element domain failed to validate content

Failed. Try again? [y,n,i,f,?]:
```

If I press "i" it says "Domain <name> XML configuration edited." and then flawlessly start that domain without any errors reported. 

Is it a bug or did I miss something during update?

Version-Release number of selected component (if applicable):
1.2.14

How reproducible:
Every time

Steps to Reproduce:
1. virsh edit <domainname> 
2. <change something>
3. save and exit

Actual results:
error: XML document failed to validate against schema: Unable to validate doc against /usr/share/libvirt/schemas/domain.rng
Extra element devices in interleave
Element domain failed to validate content



Expected results:
Domain <domainname> XML configuration edited.

Additional info:

Config is attached