[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/8ed8... : SUCCESS in 3m 30s - periodic-congress-python27-newton http://logs.openstack.org/periodic-stable/periodic-congress-python27-newton/... : SUCCESS in 4m 45s - periodic-congress-docs-ocata http://logs.openstack.org/periodic-stable/periodic-congress-docs-ocata/d39b1... : SUCCESS in 2m 43s - periodic-congress-python27-ocata http://logs.openstack.org/periodic-stable/periodic-congress-python27-ocata/b... : FAILURE in 7m 54s