Update git submodules

* Update docs/submodules/apex from branch 'stable/euphrates'
  - Fixes python-networking-sfc install

    Change-Id: Ib86cd5845e94e351615c3eb7db07b6a3bcec966f
    Signed-off-by: Tim Rozet <trozet@redhat.com>
    (cherry picked from commit 38907e27e354e2c7806b63d9482b6246c6685022)

diff --git a/docs/submodules/apex b/docs/submodules/apex
index 1ffe380..2be3a2c 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit 1ffe380a91d9751c480d3e9c344d412c49ad72d2
+Subproject commit 2be3a2ce5c1c90c489f424bc9ac80de5336bbcc5