Update VNFD delete message
Update VNFD delete message

fixed the message to use VNFD instead of device-template

Closes-bug: #1481888
Co-Authored-By: gong yong sheng <c7855879c9f889bb7095e225592f2f9cf60b5efc@99cloud.net>
Co-Authored-By: Rajkumar Kuppuraj <cebb9b7634b157f3da8f5022a678b948132b11c9@cable.comcast.com>
Change-Id: I043e0def61e57a464829c8d416ad45ad9d05c24d

zeinsteinz/tacker,openstack/tacker,stackforge/tacker,trozet/tacker,stackforge/tacker,openstack/tacker,priya-pp/Tacker,trozet/tacker,priya-pp/Tacker,zeinsteinz/tacker,openstack/tacker