Update git submodules

* Update docs/submodules/clover from branch 'stable/gambia'
  - Test cloverctl tarball download from git

    - This file will be updated when outstanding patches
    are merged.
    - This is a test for the config guide docs to validate
    download procedure.

    Change-Id: Iebc79b14b1e74ca09f85f1f5846b0f4f43c782ba
    Signed-off-by: earrage <eddie.arrage@huawei.com>

diff --git a/docs/submodules/clover b/docs/submodules/clover
index d8208d0..6f51d83 160000 (submodule)
--- a/docs/submodules/clover
+++ b/docs/submodules/clover
@@ -1 +1 @@
-Subproject commit d8208d08c823a2ffc29fa189bd2915cf94bb9c2d
+Subproject commit 6f51d83c09a33402adea9c55e53da8d9c8a84840