Comment 7 for bug 1737593

Sanities on mainline are failing due to this. This commit (https://github.com/Juniper/contrail-server-manager/commit/9f132d7bc53f8cacdcd76533afea8d3dd6a31bab ) that went in a day ago causes image add to fail with the below error:-

root@nodea10:~# server-manager add image -f /var/log/contrail/sm_provisioning/2017_12_15__07_51_11/image.json

{
    "return_code": 8,
    "return_data": null,
    "return_msg": "Invalid role in image json: rabbitmq"
}
root@nodea10:~#

debug.log:-
"2017-12-15 09:09:28,343-ERROR-server_mgr_main.py:1900-validate_container_image(): Invalid role in image json: rabbitmq"