Update git submodules

* Update docs/submodules/barometer from branch 'stable/danube'
  - Fix for Functest 'BarometerCollectd ERROR - Private key file not found'

    This patch addresses the blocking Functest issue regarding the ssh keys.
    It eliminates the need of using the baro_utils/get_ssh_keys.sh script.

    Change-Id: I4499e48257ddab955ae6694c2ece0bff5e877cad
    Signed-off-by: Calin Gherghe <calin.gherghe@intel.com>
    (cherry picked from commit 1573180333a8b1a49dc21f6412f53fff01fe351e)

diff --git a/docs/submodules/barometer b/docs/submodules/barometer
index f237c12..6634f2a 160000 (submodule)
--- a/docs/submodules/barometer
+++ b/docs/submodules/barometer
@@ -1 +1 @@
-Subproject commit f237c12fd5832dae68630f1d39e8b6c5bdb59f9d
+Subproject commit 6634f2aa7738e94f78735f3a20827fabf3f2c5fa