Update git submodules

* Update docs/submodules/apex from branch 'master'
  - Fixes missing permissions on configure-vm

    Also updates dpdk package location

    Change-Id: I123c3d8593b623f45273845726870224ff9f7ca8
    Signed-off-by: Tim Rozet <trozet@redhat.com>

diff --git a/docs/submodules/apex b/docs/submodules/apex
index dcd47c9..5d52dc8 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit dcd47c9bfd51cd8b84fecbe44b49d589ac821adc
+Subproject commit 5d52dc853acabfedf5d52130991650920832e801