Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Change to Gambia version by using latest docker images

    Functest use gambia tag. Other projects use their latest one.

    Change-Id: Ibbfde50727149822d8331d998f6b4e173f19e244
    Signed-off-by: xudan <xudan16@huawei.com>

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index 507a31e..cd4962c 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit 507a31ea7ece33a887379db3fb836d5d5d0af582
+Subproject commit cd4962c9ca223f8b4287dc2123ac40a8652a1028