Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Switching to functest:fraser container tag

    switching to functest:fraser from functest:opnfv-6.0.0 to incorporate
    bug fixes which have been backported to stable/fraser.

    Change-Id: Ieab9064ac0187b3460b09fe74861fc844b0b0195
    Signed-off-by: Georg Kunz <georg.kunz@ericsson.com>

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index 8048568..9cdaaae 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit 8048568b27c8b6fb5a5a269c66f722bceb4b338d
+Subproject commit 9cdaaae34d5d814c71a92d7092a5c9a8ab705c04