Update git submodules

* Update docs/submodules/container4nfv from branch 'master'
  - Basic setup for istio sidecar auto injection

    To enable auto sidecar injection on specific namespace,
    you only need label the namespace with `istio-injection=enabled`, e.g.:
        kubectl label namespace default istio-injection=enabled

    For details please refer:
        https://istio.io/docs/setup/kubernetes/sidecar-injection.html#automatic-sidecar-injection

    Change-Id: I2059aa0be2ab3f4f942342850d286281c5f940d4
    Signed-off-by: QiLiang <liangqi1@huawei.com>

diff --git a/docs/submodules/container4nfv b/docs/submodules/container4nfv
index d963990..cf66279 160000 (submodule)
--- a/docs/submodules/container4nfv
+++ b/docs/submodules/container4nfv
@@ -1 +1 @@
-Subproject commit d96399015d64132b24f43a7fdd376a6fb109e28a
+Subproject commit cf66279af8fb33c9bb410777c16218cadbf4dcd6