In the drivers section of magnum.conf add openstack_ca_file.
This file is expected to be a CA Certificate OR CA bundle
which will be passed on every node and it will be installed
on the host's CA bundle.
Update devstack plugin to use the ssl bundle if tls-proxy is
enabled.
Install the CA for drivers:
k8s_coreos_v1
k8s_fedora_atomic_v1
k8s_fedora_ironic_v1
mesos_ubuntu_v1
swarm_fedora_atomic_v1
swarm_fedora_atomic_v2
Add doc in troubleshooting-guide.
Add release notes.
Closes-Bug: #1580704
Partially-Implements: blueprint heat-agent
Change-Id: Id48fbea187da667a5e7334694c3ec17c8e2504db