Update git submodules

* Update docs/submodules/compass4nfv from branch 'master'
  - Docs update for E release

    JIRA: -

    Update the structure of docs directory.
    Update the docs for E release.
    Add some new docs for E release.

    Change-Id: Ib4b6aced3d6ac88404d8518b5461e20d26e017e1
    Signed-off-by: Yifei Xue <xueyifei@huawei.com>

diff --git a/docs/submodules/compass4nfv b/docs/submodules/compass4nfv
index 0ebcf5e..c450b54 160000 (submodule)
--- a/docs/submodules/compass4nfv
+++ b/docs/submodules/compass4nfv
@@ -1 +1 @@
-Subproject commit 0ebcf5e461c5cecfb23b4497d8966485fd504c55
+Subproject commit c450b54ffb461e5a9a157b13679686170f7c385d