Update git submodules

* Update docs/submodules/compass4nfv from branch 'master'
  - Add external veth pair

    JIRA: COMPASS-604

    Add veth pair and connect them to br-external.
    OpenDaylight can bind that veth instead of the
    external interface.

    Change-Id: I26f122bf8cab0943b7b056050de01381bab6d395
    Signed-off-by: Harry Huang <huangxiangyu5@huawei.com>

diff --git a/docs/submodules/compass4nfv b/docs/submodules/compass4nfv
index 568068c..7811e71 160000 (submodule)
--- a/docs/submodules/compass4nfv
+++ b/docs/submodules/compass4nfv
@@ -1 +1 @@
-Subproject commit 568068caa189a8643cdd53de774259ab76297d43
+Subproject commit 7811e71b5c7eb4884be9d66b6c0d4cf30def87fb