Update git submodules

* Update docs/submodules/apex from branch 'master'
  - Merge "barometer: move to opnfv puppet repo"
  - barometer: move to opnfv puppet repo

    The barometer puppet scripts have been moved to the barometer repo. This
    change migrates the Apex builds to using the barometer repo.

    Change-Id: I064c40746d19e5deb305c503128b357479b7149c
    Signed-off-by: Maryam Tahhan <maryam.tahhan@intel.com>

diff --git a/docs/submodules/apex b/docs/submodules/apex
index 70fd800..b4697b5 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit 70fd8005504c6db51c7dfb1f9c52ef904ab3d181
+Subproject commit b4697b5cd6c5c0432fcd12ca78785f425e5fcf5b