Fix SSLError caused by not passing the cafile
Fix SSLError caused by not passing the cafile

When tls is enabled, the cafile needs to be passed in the session.

Change-Id: I176e3876f2652608aaf51b0f74f4d971d31253e2
Closes-Bug: #1890558
Signed-off-by: ZijianGuo <38c705c27b00a669115c1565bbb1e1dbc3cad170@gmail.com>

openstack/zaqar,openstack/zaqar,openstack/zaqar,openstack/zaqar