Update git submodules

* Update docs/submodules/apex from branch 'master'
  - Merge "Fixes python-networking-sfc install"
  - Fixes python-networking-sfc install

    Change-Id: Ib86cd5845e94e351615c3eb7db07b6a3bcec966f
    Signed-off-by: Tim Rozet <trozet@redhat.com>

diff --git a/docs/submodules/apex b/docs/submodules/apex
index 11be8e7..864527c 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit 11be8e73043eeaa9ec18508410ec28faecbccc08
+Subproject commit 864527cb7a61eda541aa812fe985843989595e9a