libct/int: make newTemplateConfig argument a struct

...so we can add more fields later.

This commit is mostly courtesy of

sed -i 's/newTemplateConfig(rootfs)/newTemplateConfig(\&tParam{rootfs: rootfs})/g'

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

libcontainer/integration/checkpoint_test.go

@@ -76,7 +76,7 @@ func testCheckpoint(t *testing.T, userns bool) {
 	}
 	defer remove(rootfs)
 
-	config := newTemplateConfig(rootfs)
+	config := newTemplateConfig(&tParam{rootfs: rootfs})
 
 	if userns {
 		config.UidMappings = []configs.IDMap{{HostID: 0, ContainerID: 0, Size: 1000}}