This patch imports OVN LB functional tests. Unfortunately neutron hasn't been released yet so for test requirements we need to install it from git, from commit that imports functional base class to neutron .  https://review.opendev.org/#/c/701733/ Change-Id: Ia65492db1688f3a3fce22a4432ae8445f67c37b3
Collect journal log from test run
By default, this stores journal log into log file and store it in "journal_log_file_path"