This was seen in a netvirt 3node job:
The job has the karaf logs, and in the log for ODL2 I saw this:
2017-09-08 12:43:45,101 | ERROR | Event Dispatcher | AbstractDataStore | 203 - org.opendaylight.controller.sal-distributed-datastore - 1.5.2.SNAPSHOT | Shard leaders failed to settle in 90 seconds, giving up
The system tests were pasing ok until this point, after which a lot
of failures were seen.