SR-IOV enabled instance migration doesn't work

Upstream bug: https://bugs.launchpad.net/nova/+bug/1512880

Migration of SR-IOV enabled instance fails with following error:

libvirtError: Device 0000:03:11.4 not found: could not access /sys/bus/pci/devices/0000:03:11.4/config: No such file or directory

Steps to reproduce:
1. Create environment with following configuration: 1 Controller, Ceph for all storage
2. Add at least two computes with NICs that support SR-IOV
3. Deploy environment
4. Boot SR-IOV-enabled instance
5. Migrate SR-IOV-enabled instance

Expected result: Instance is successfully migrated
Actual result: Instance migration fails

cat /etc/fuel_build_id:
 113
cat /etc/fuel_build_number:
 113
cat /etc/fuel_release:
 9.0
cat /etc/fuel_openstack_version:
 liberty-9.0
rpm -qa | egrep 'fuel|astute|network-checker|nailgun|packetary|shotgun':
 fuel-library9.0-9.0.0-1.mos8198.noarch
 fuel-agent-9.0.0-1.mos266.noarch
 nailgun-mcagents-9.0.0-1.mos730.noarch
 fuel-misc-9.0.0-1.mos8198.noarch
 python-packetary-9.0.0-1.mos128.noarch
 fuel-bootstrap-cli-9.0.0-1.mos266.noarch
 fuel-provisioning-scripts-9.0.0-1.mos8575.noarch
 network-checker-9.0.0-1.mos72.x86_64
 fuel-mirror-9.0.0-1.mos128.noarch
 fuel-openstack-metadata-9.0.0-1.mos8575.noarch
 fuel-notify-9.0.0-1.mos8198.noarch
 fuel-setup-9.0.0-1.mos6318.noarch
 python-fuelclient-9.0.0-1.mos292.noarch
 fuelmenu-9.0.0-1.mos263.noarch
 fuel-9.0.0-1.mos6318.noarch
 fuel-utils-9.0.0-1.mos8198.noarch
 fuel-nailgun-9.0.0-1.mos8575.noarch
 fuel-ostf-9.0.0-1.mos919.noarch
 fuel-release-9.0.0-1.mos6318.noarch
 rubygem-astute-9.0.0-1.mos730.noarch
 shotgun-9.0.0-1.mos85.noarch
 fuel-ui-9.0.0-1.mos2613.noarch
 fuel-migrate-9.0.0-1.mos8198.noarch