[JIRA] (OVIRT-1858) upgrade jenkins.ovirt.org to 2.89.3 LTS

upgrade jenkins.ovirt.org to 2.89.3 LTS --------------------------------------- Key: OVIRT-1858 URL: https://ovirt-jira.atlassian.net/browse/OVIRT-1858 Project: oVirt - virtualization made easy Issue Type: Task Reporter: Evgheni Dereveanchin Assignee: Evgheni Dereveanchin Jenkins 2.89.3 LTS is out, our instance needs to be updated. There is also a new security advisory out so we will bump plugin versions: https://jenkins.io/security/advisory/2018-01-22/