Update git submodules

* Update docs/submodules/apex from branch 'master'
  - Merge "Updates SFC to use nitrogen"
  - Updates SFC to use nitrogen

    Also fixes issue where openvswitch NSH rpm was not getting installed
    because we needed to downgrade now that default OVS is 2.7 and NSH OVS
    is 2.6.1

    Change-Id: I1b639ca80214032e93aacb3332e9588d49e74127
    Signed-off-by: Tim Rozet <trozet@redhat.com>

diff --git a/docs/submodules/apex b/docs/submodules/apex
index 8669c68..071de3a 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit 8669c687a75a00106b055add49b82fee826b8fe8
+Subproject commit 071de3a4a11326d5f0c371a2ebeed703f1a40980