Update git submodules

* Update docs/submodules/barometer from branch 'master'
  - ci: fix snmp-agent commit ID

    Fix the commit ID used to build collectd to make sure that the
    snmp-agent gets built.

    Change-Id: I4ffef1ee8649800c44eb256d70dbcf15a0445a8d
    Signed-off-by: Maryam Tahhan <maryam.tahhan@intel.com>

diff --git a/docs/submodules/barometer b/docs/submodules/barometer
index 2d4b6c3..bb4cd4a 160000 (submodule)
--- a/docs/submodules/barometer
+++ b/docs/submodules/barometer
@@ -1 +1 @@
-Subproject commit 2d4b6c3388164977cf2d115af65c0b4a9e9df2a4
+Subproject commit bb4cd4a808844bad8cf42617fbbd29f24c4308e8