Update git submodules

* Update docs/submodules/clover from branch 'stable/gambia'
  - Merge "Update modsecurity image docker registry" into stable/gambia
  - Update modsecurity image docker registry

    The clover-ns-modsecurity-crs docker image is now built by Jenkins and uploaded
    to the OPNFV docker hub.
    This patch updates the modsecurity deployment kubernetes manifest to pull image from OPNFV docker hub.

    Change-Id: I7e8afd27f726600de9247fc98fe3f5d491000f1c
    Signed-off-by: JingLu5 <lvjing5@huawei.com>

diff --git a/docs/submodules/clover b/docs/submodules/clover
index d4a2ca0..523fad9 160000 (submodule)
--- a/docs/submodules/clover
+++ b/docs/submodules/clover
@@ -1 +1 @@
-Subproject commit d4a2ca01c0ab9532e2ba8abc8ad086784af32d75
+Subproject commit 523fad972276b3b31ff848d48ddaece13b860ccc