Update git submodules

* Update docs/submodules/apex from branch 'stable/danube'
  - Merge "Fix quagga user and dirs" into stable/danube
  - 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>
    (cherry picked from commit 7dcaaf6f8f7af379124c65f3a19f4890064fa97c)

diff --git a/docs/submodules/apex b/docs/submodules/apex
index c056642..8d22b80 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit c056642b88365a0b328aa7646cbd9bdb3ae35fc1
+Subproject commit 8d22b800fe8d26748abc35f59c034936624a29b3