[fuel-devops] Network interface filter breaks XML validation

[Vladimir Khlyunev]

Steps to reproduce:
- Install fuel-devops 2.9.20 of higher
- Create any env
- Try to edit VM's configuration via 'virsh edit'

Result:
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,?]:

I discovered that 2.9.19 is not affected; also I'v removed lines like
"<filterref filter='upgrade_env_admin_64:85:97:f0:51:1b'/>" and validation was passed.

We need to investigate why we can't validate filters. This bug affects on upgrade 7->8 tests.

libvirt-bin 1.3.1-1ubuntu10
qemu-kvm 1:2.5+dfsg-5ubuntu10.1

[Vladimir Khlyunev (vkhlyunev)]

Also reproduced on libvirt 1.2 and qemu 2.4

[Aleksei Stepanov (penguinolog)]

Devops 2.9 last - not actual with disabled nwfilter
Devops 3.0 - actual

[Vladimir Khlyunev (vkhlyunev)]

Affected only 2.9.20 by default - in release/2.9 nwfilters are disabled by default; however this issue will be reproduced when nwfilters are enabled by env var

[Sergey Novikov (snovikov)]

jfyi, The issue was not reproduced against 2.9.23 with enabled nwfilters (the corresponding variable is ENABLE_LIBVIRT_NWFILTERS in the devops settings).
(libvirt 1.2 and qemu 2.4)