Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Updating user guide with new ssh key config in pod.yaml

    Dovetail does not copy the ssh key from pre_config to /root/.ssh anymore
    inside Yardstick but instead, we point the pod.yaml file directly to the
    key inside the pre_config directory.

    JIRA: DOVETAIL-655

    Change-Id: I23156d8940194547363bcf9a5cc581aab0d5c640
    Signed-off-by: Georg Kunz <georg.kunz@ericsson.com>

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index db0ea3a..9d93e33 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit db0ea3aa638297966faa37b23c3156abe96d1b8c
+Subproject commit 9d93e3383376dab08257b9e70d9e68ad99608989