tui: Use fileConfig based logging for 2.6 pycompat

This swaps the config to use a file based version, there is additional work
around the temporary log file to permanent /var/log/ovirt-node.log to
complete in the new tui.

Signed-off-by: Joey Boggs <jboggs@redhat.com>
Change-Id: Ib57350d7a6b62a75a31b59545a2552ed64013b7f