Some containers exiting with 143 instead of 0, but
this is still OK. This patch just allows
ExitCode 143 (SIGTERM) as fix. Details in
bugreport.

Services which exited with 143 (SIGTERM):

kolla-cron-container.service
kolla-designate_producer-container.service
kolla-keystone_fernet-container.service
kolla-letsencrypt_lego-container.service
kolla-magnum_api-container.service
kolla-mariadb_clustercheck-container.service
kolla-neutron_l3_agent-container.service
kolla-openvswitch_db-container.service
kolla-openvswitch_vswitchd-container.service
kolla-proxysql-container.service

Partial-Bug: #2048130
Change-Id: Ia8c85d03404cfb368e4013066c67acd2a2f68deb