Update git submodules

* Update docs/submodules/compass4nfv from branch 'stable/danube'
  - Fix some opera related error

    1. echo a string to compass log to avoid deploy error
    bing concealed
    2. judge return code of ./opera_launch.sh

    Change-Id: I7ac2bac9b600f289c01116e7f7777d1219a58eb2
    Signed-off-by: Harry Huang <huangxiangyu5@huawei.com>

diff --git a/docs/submodules/compass4nfv b/docs/submodules/compass4nfv
index b52dade..8f30723 160000 (submodule)
--- a/docs/submodules/compass4nfv
+++ b/docs/submodules/compass4nfv
@@ -1 +1 @@
-Subproject commit b52dade4c2d8ee662f22893c9527196e0074b20d
+Subproject commit 8f307233248edcd8d191f7bbb113330170638a72