Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Adding documentation for API validation exemption

    Updating the user guide and OVP addendum to include references to the
    detailed document describing the API response validation exemption.

    JIRA: DOVETAIL-651

    Change-Id: I4026f84f021704f0986b45680471e8fb711fc314
    Signed-off-by: Georg Kunz <georg.kunz@ericsson.com>

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index 962f8ed..8048568 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit 962f8ed21b97d40bc501c4854a4e28310023642d
+Subproject commit 8048568b27c8b6fb5a5a269c66f722bceb4b338d