Add unit tests for default templates delete functionality
Add unit tests for default templates delete functionality

Change-Id: Ia2ab3cbede2e6cd4d6286f75af1d850a1b757d84
Partial-Implements: blueprint default-templates

zhujzhuo/Sahara,openstack/sahara,crobby/sahara,zhangjunli177/sahara,henaras/sahara,redhat-openstack/sahara,henaras/sahara,bigfootproject/sahara,ekasitk/sahara,bigfootproject/sahara,zhangjunli177/sahara,matips/iosr-2015,esikachev/sahara-backup,esikachev/sahara-backup,crobby/sahara,ekasitk/sahara,matips/iosr-2015,zhujzhuo/Sahara,openstack/sahara,tellesnobrega/sahara,henaras/sahara,redhat-openstack/sahara,egafford/sahara,crobby/sahara,matips/iosr-2015,ekasitk/sahara,esikachev/sahara-backup,tellesnobrega/sahara,bigfootproject/sahara,zhujzhuo/Sahara,zhangjunli177/sahara,redhat-openstack/sahara,egafford/sahara