Why: LF will install system updates on all ODL nodes and services.
Impact: Users may be unable to access any services (Jira, Gerrit, Wiki, Jenkins, Sonar, Nexus) during this time.
Jenkins will be put in shutdown mode before the window starts and any long-running Jenkins jobs _will_ be canceled if they don't complete before the start of the window.
Notices will be posted to the mailing lists and in #opendaylight on Freenode at the start and end of the maintenance.
