I didn't understand how to resolve. I have encountered this problem too.
My rabbitmq  image build continues to fail.Here is the command and associated errors:

INFO:kolla.cmd.build:ironic-pxe
INFO:kolla.cmd.build:gnocchi-statsd
INFO:kolla.cmd.build:trove-conductor
INFO:kolla.cmd.build:Images that failed to build
INFO:kolla.cmd.build:===========================
ERROR:kolla.cmd.build:heka Failed with status: error
ERROR:kolla.cmd.build:rabbitmq Failed with status: error
({'heka': 'error', 'rabbitmq': 'error'}, {'aodh-expirer': 'built', 'nova-api': 'built', 'cinder-base': 'built', 'swift-container': 'built', 'designate-api': 'built', 'kolla-toolbox': 'built', 'heat-engine': 'built', 'gnocchi-base': 'built', 'openvswitch-vswitchd': 'built', 'nova-network': 'built', 'trove-base': 'built', 'heat-api-cfn': 'built', 'aodh-base': 'built', 'murano-engine': 'built', 'neutron-server': 'built', 'magnum-base': 'built', 'magnum-conductor': 'built', 'murano-api': 'built', 'mistral-executor': 'built', 'nova-spicehtml5proxy': 'built', 'aodh-api': 'built', 'nova-libvirt': 'built', 'cinder-api': 'built', 'manila-api': 'built', 'nova-base': 'built', 'kibana': 'built', 'cron': 'built', 'swift-proxy-server': 'built', 'aodh-evaluator': 'built', 'tempest': 'built', 'trove-guestagent': 'built', 'neutron-linuxbridge-agent': 'built', 'nova-ssh': 'built', 'magnum-api': 'built', 'keepalived': 'built', 'iscsid': 'built', 'openstack-base': 'built', 'keystone': 'built', 'mongodb': 'built', 'ceph-mon': 'built', 'memcached': 'built', 'base': 'built', 'tgtd': 'built', 'haproxy': 'built', 'ceilometer-collector': 'built', 'glance-api': 'built', 'swift-base': 'built', 'elasticsearch': 'built', 'horizon': 'built', 'cinder-scheduler': 'built', 'designate-sink': 'built', 'murano-base': 'built', 'dind': 'built', 'trove-api': 'built', 'designate-poolmanager': 'built', 'neutron-openvswitch-agent': 'built', 'ceilometer-compute': 'built', 'manila-scheduler': 'built', 'ceilometer-central': 'built', 'nova-novncproxy': 'built', 'designate-backend-bind9': 'built', 'gnocchi-api': 'built', 'ceilometer-base': 'built', 'heat-api': 'built', 'aodh-notifier': 'built', 'cinder-backup': 'built', 'nova-conductor': 'built', 'neutron-base': 'built', 'designate-central': 'built', 'neutron-l3-agent': 'built', 'ironic-api': 'built', 'mistral-base': 'built', 'mistral-api': 'built', 'cinder-rpcbind': 'built', 'swift-object': 'built', 'openvswitch-base': 'built', 'ceph-base': 'built', 'cinder-volume': 'built', 'ceilometer-api': 'built', 'trove-taskmanager': 'built', 'swift-rsyncd': 'built', 'aodh-listener': 'built', 'glance-registry': 'built', 'openvswitch-db-server': 'built', 'ceph-rgw': 'built', 'ironic-base': 'built', 'mistral-engine': 'built', 'zaqar': 'built', 'nova-consoleauth': 'built', 'designate-base': 'built', 'neutron-dhcp-agent': 'built', 'heat-base': 'built', 'designate-mdns': 'built', 'ceilometer-notification': 'built', 'ironic-inspector': 'built', 'ironic-conductor': 'built', 'nova-scheduler': 'built', 'manila-base': 'built', 'manila-share': 'built', 'ceph-osd': 'built', 'mariadb': 'built', 'swift-account': 'built', 'nova-compute': 'built', 'neutron-metadata-agent': 'built', 'nova-compute-ironic': 'built', 'glance-base': 'built', 'ironic-pxe': 'built', 'gnocchi-statsd': 'built', 'trove-conductor': 'built'}, {})