Update git submodules

* Update docs/submodules/apex from branch 'master'
  - Merge "Fix quagga user and dirs"
  - Fix quagga user and dirs

    The rpm spec of quagga still misses the
    correct user and dir setup for quagga.

    This is the jira to remove this later on:
    https://jira.opnfv.org/projects/SDNVPN/issues/SDNVPN-130

    Change-Id: I71885a6b177443f58d0c093833e76656eb83b428
    Signed-off-by: Nikolas Hermanns <nikolas.hermanns@ericsson.com>

diff --git a/docs/submodules/apex b/docs/submodules/apex
index 5108498..97de7b9 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit 5108498adb2870581cc5a4bb99db693a05ff9c3b
+Subproject commit 97de7b9e2bdcb63613c99b9db4d77ad125d410f0