Failing 8.0-pkg-install-ubuntu test for liberty branch of openstack/ironic

Build-team, 8.0-pkg-install-ubuntu fails with the following errors:
+ egrep 'TRACE|ERROR' /var/log/ironic/ironic-conductor.log /var/log/ironic/ironic-dbsync.log
/var/log/ironic/ironic-conductor.log:2016-05-19 12:40:38.526 8735 ERROR ironic.common.service [-] Service error occurred when cleaning up the RPC manager. Error: 'ConductorManager' object has no attribute '_keepalive_evt'
/var/log/ironic/ironic-conductor.log:2016-05-19 12:40:38.526 8735 ERROR ironic.common.service Traceback (most recent call last):
/var/log/ironic/ironic-conductor.log:2016-05-19 12:40:38.526 8735 ERROR ironic.common.service File "/usr/lib/python2.7/dist-packages/ironic/common/service.py", line 94, in stop
/var/log/ironic/ironic-conductor.log:2016-05-19 12:40:38.526 8735 ERROR ironic.common.service self.manager.del_host(deregister=self.deregister)
/var/log/ironic/ironic-conductor.log:2016-05-19 12:40:38.526 8735 ERROR ironic.common.service File "/usr/lib/python2.7/dist-packages/ironic/conductor/manager.py", line 330, in del_host
/var/log/ironic/ironic-conductor.log:2016-05-19 12:40:38.526 8735 ERROR ironic.common.service self._keepalive_evt.set()
/var/log/ironic/ironic-conductor.log:2016-05-19 12:40:38.526 8735 ERROR ironic.common.service AttributeError: 'ConductorManager' object has no attribute '_keepalive_evt'
/var/log/ironic/ironic-conductor.log:2016-05-19 12:40:38.526 8735 ERROR ironic.common.service
/var/log/ironic/ironic-conductor.log:2016-05-19 12:40:38.817 11651 DEBUG ironic.cmd.conductor [-] logging_exception_prefix = %(asctime)s.%(msecs)03d %(process)d ERROR %(name)s %(instance)s log_opt_values /usr/lib/python2.7/dist-packages/oslo_config/cfg.py:2225
/var/log/ironic/ironic-conductor.log:2016-05-19 12:40:38.844 11651 DEBUG oslo_service.service [-] logging_exception_prefix = %(asctime)s.%(msecs)03d %(process)d ERROR %(name)s %(instance)s log_opt_values /usr/lib/python2.7/dist-packages/oslo_config/cfg.py:2225
/var/log/ironic/ironic-conductor.log:2016-05-19 12:40:39.037 11651 DEBUG oslo_db.sqlalchemy.engines [req-369fc328-5979-4558-96e2-ba5a52f99fe2 admin - - - -] MySQL server mode set to STRICT_TRANS_TABLES,STRICT_ALL_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,TRADITIONAL,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION _check_effective_sql_mode /usr/lib/python2.7/dist-packages/oslo_db/sqlalchemy/engines.py:256

This issue is a blocker of upstream sync and though has to be solved ASAP.

Example reviews:
    https://review.fuel-infra.org/#/c/20887/
    https://review.fuel-infra.org/#/c/20938/

Example jobs:
    https://packaging-ci.infra.mirantis.net/job/8.0-pkg-install-ubuntu/2413