Update git submodules

* Update docs/submodules/clover from branch 'stable/fraser'
  - Merge "Modified validation script for tracing to support CI" into stable/fraser
  - Modified validation script for tracing to support CI

    - Manual cherry pick to stable/fraser of patch:
    https://gerrit.opnfv.org/gerrit/#/c/55387/

    Change-Id: I965326b30b2f6266f147de77c4064833856aa186
    Signed-off-by: Eddie Arrage <eddie.arrage@huawei.com>

diff --git a/docs/submodules/clover b/docs/submodules/clover
index 6e64b78..907f581 160000 (submodule)
--- a/docs/submodules/clover
+++ b/docs/submodules/clover
@@ -1 +1 @@
-Subproject commit 6e64b78f544be47d20692b39ac8bb1229b33ec7c
+Subproject commit 907f5812c9e8b1976b9068700c4811df0429f97d