Update git submodules

* Update docs/submodules/apex from branch 'stable/fraser'
  - Merge "Fix nosdn fdio scenario" into stable/fraser
  - Fix nosdn fdio scenario

    - Update networking-vpp to use master branch
    - Update THT vpp ml2 environment file with correct parameters
    - Update external network creation command to use 'externa' as
      provider network name.
    - Remove vpp network settings file as it's not used

    apex-tripleo-heat-templates: Ia25db8456f1ad6beb96c7b9b5f318b166ef4576a
    apex-puppet-tripleo: I231054a433eb7e598a6e24f6eaea02d476e776de

    Change-Id: I4a1f68c75ae3b7d2a5b347d05abf0d025e8b116b
    Signed-off-by: Feng Pan <fpan@redhat.com>
    (cherry picked from commit 5acf4e708c68147ef20c67f8d4648e6027c1e20d)

diff --git a/docs/submodules/apex b/docs/submodules/apex
index 340a247..e47c969 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit 340a2478d1e2c89511e3245e30ccefa216f5473c
+Subproject commit e47c969c9fd655b87670de13a4daac343a08f6db