Add name into dummy engine schema and make it required
Add name into dummy engine schema and make it required

In the super class EngineFactory, the engine name is got from deployment.
So each deploy engine should have the name.
The patch is to add name to DummyEngine and make it required.

Change-Id: Ic5da73b2f4cffe1cad0fe104203b267b2501af6e

ytsarev/rally,go-bears/rally,redhat-openstack/rally,pandeyop/rally,eonpatapon/rally,vganapath/rally,vponomaryov/rally,vefimova/rally,go-bears/rally,group-policy/rally,yeming233/rally,eayunstack/rally,aplanas/rally,aforalee/RRally,cernops/rally,vponomaryov/rally,paboldin/rally,gluke77/rally,shdowofdeath/rally,vganapath/rally,vganapath/rally,openstack/rally,yeming233/rally,afaheem88/rally,eayunstack/rally,gluke77/rally,pandeyop/rally,eayunstack/rally,vganapath/rally,amit0701/rally,shdowofdeath/rally,redhat-openstack/rally,paboldin/rally,aforalee/RRally,group-policy/rally,group-policy/rally,gluke77/rally,aplanas/rally,varunarya10/rally,openstack/rally,gluke77/rally,openstack/rally,amit0701/rally,openstack/rally,eonpatapon/rally,afaheem88/rally,cernops/rally,vefimova/rally,pyKun/rally,paboldin/rally,amit0701/rally,ytsarev/rally,varunarya10/rally,pyKun/rally