Update git submodules

* Update docs/submodules/compass4nfv from branch 'master'
  - Update release notes for Danube release

    JIRA: -

      1. Add known issues and workaroud instructions
      2. Update Danube release date

    Change-Id: I6058dcf7db478d680999f451f5959ec4f998036f
    Signed-off-by: Justin chi <chigang@huawei.com>
    Signed-off-by: chigang <chigang@huawei.com>

diff --git a/docs/submodules/compass4nfv b/docs/submodules/compass4nfv
index d52a117..0523f8c 160000 (submodule)
--- a/docs/submodules/compass4nfv
+++ b/docs/submodules/compass4nfv
@@ -1 +1 @@
-Subproject commit d52a11770689f4fd4d2bc4b9bf8dc09d4dd62ebf
+Subproject commit 0523f8c84d0dd1530c725b08d881653f8522287f