libpod: set cid network alias in setupContainer()

Since we have sqlite there is no point in duplicating this acroos two db
backends. Just set earlier when we validate the networks anyway.

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

libpod/runtime_ctr.go

@@ -282,6 +282,8 @@ func (r *Runtime) setupContainer(ctx context.Context, ctr *Container) (_ *Contai
 					return nil, errors.New("failed to find free network interface name")
 				}
 			}
+			// always add the short id as alias for docker compat
+			opts.Aliases = append(opts.Aliases, ctr.config.ID[:12])
 
 			normalizeNetworks[netName] = opts
 		}