Update git submodules

* Update docs/submodules/barometer from branch 'master'
  - Configure collectd to load ipmi before PMU

    Collectd loads config files in alphabetical order.
    Ansible creates the config files for collectd.
    In this patch we change the name ipmi.conf to 0_ipmi.conf
    This will allow ipmi to be loaded before PMU.
    If PMU is loaded before ipmi the container will crash.
    This is a bug in collectd 5.8

    Change-Id: I3334a3a1970f596e36f665698649d6c04fd38fbb
    Signed-off-by: John O Loughlin <john.oloughlin@intel.com>

diff --git a/docs/submodules/barometer b/docs/submodules/barometer
index ed61877..4fa0049 160000 (submodule)
--- a/docs/submodules/barometer
+++ b/docs/submodules/barometer
@@ -1 +1 @@
-Subproject commit ed61877e2ba389ada8c4e60160b43e999f23d60b
+Subproject commit 4fa004981ab3073bcec477d36900924990bcfccd