parselogs.py: ignore network interface name changing failure
The following error from systemd-udevd is not harmful. It's just
because our qemu targets are using eth0.
Error changing net interface name 'eth0' to 'enp0s3': Device or resource busy
Note that systemd is using a different network interface naming scheme
from traditional ethX naming scheme. To make this error message go away,
we could symlink /etc/udev/rules.d/80-net-setup-link.rules to /dev/null
to recover traditional naming scheme. But I'm not sure if this will
cause regression in user experience for systemd users of OE.
So just ignore this error message so that parselogs.py test case does not
fail.
