Update git submodules

* Update docs/submodules/clover from branch 'master'
  - Fix missing psutil dependency in nginx services

    - A psutil dependency was added in the latest Clover server version
    that was not added to the docker builds of the lb/proxy

    Change-Id: Id48c3446a93d6b9cef65d453266d0bf15eddf6cc
    Signed-off-by: Eddie Arrage <eddie.arrage@huawei.com>

diff --git a/docs/submodules/clover b/docs/submodules/clover
index 9919161..bf2f1c7 160000 (submodule)
--- a/docs/submodules/clover
+++ b/docs/submodules/clover
@@ -1 +1 @@
-Subproject commit 9919161fee48f5f212611ade97d513f146f0139f
+Subproject commit bf2f1c7aa3491f683b1660de68876cf2731f64a4