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

Build failed. - periodic-congress-docs-newton http://logs.openstack.org/periodic-stable/periodic-congress-docs-newton/fb26... : SUCCESS in 4m 19s - periodic-congress-python27-newton http://logs.openstack.org/periodic-stable/periodic-congress-python27-newton/... : FAILURE in 6m 06s - periodic-congress-docs-ocata http://logs.openstack.org/periodic-stable/periodic-congress-docs-ocata/0b54f... : SUCCESS in 5m 31s - periodic-congress-python27-ocata http://logs.openstack.org/periodic-stable/periodic-congress-python27-ocata/e... : SUCCESS in 24m 10s