build system: Remove unused etcd container.
build system: Remove unused etcd container.

... also remove unused "run" volume definition (we depend on hosts /run
directory).

vefimova/virtlet,nhlfr/virtlet,nhlfr/virtlet,vefimova/virtlet,vefimova/virtlet,Mirantis/virtlet,nhlfr/virtlet,Mirantis/virtlet,vefimova/virtlet,nhlfr/virtlet