[Openstack-stable-maint] Stable check of openstack/oslo-incubator failed

Build failed.

- periodic-oslo-incubator-docs-juno http://logs.openstack.org/periodic-stable/periodic-oslo-incubator-docs-juno/... : SUCCESS in 2m 48s - periodic-oslo-incubator-python26-juno http://logs.openstack.org/periodic-stable/periodic-oslo-incubator-python26-j... : SUCCESS in 3m 35s - periodic-oslo-incubator-python27-juno http://logs.openstack.org/periodic-stable/periodic-oslo-incubator-python27-j... : FAILURE in 4m 42s - periodic-oslo-incubator-docs-kilo http://logs.openstack.org/periodic-stable/periodic-oslo-incubator-docs-kilo/... : SUCCESS in 1m 59s - periodic-oslo-incubator-python27-kilo http://logs.openstack.org/periodic-stable/periodic-oslo-incubator-python27-k... : SUCCESS in 1m 23s