Update git submodules

* Update docs/submodules/apex from branch 'master'
  - No change to apex, change is to apex-puppet-tripleo
    Bumps the step for barometer from 4 to 5.
    apex-puppet-tripleo: I486c4045e29c7032526be6e19d11e7979070c2d9

    Change-Id: I263d687e90e747e3fdfb9690ca9209553a1a2890
    Signed-off-by: jhinman1 <john.hinman@intel.com>

diff --git a/docs/submodules/apex b/docs/submodules/apex
index 807fad2..52b4c25 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit 807fad268c90649f2901c5f5c4cdeb788a0308e0
+Subproject commit 52b4c2556b909a1e61b50f0ff75778bed962ba85