Update git submodules

* Update docs/submodules/compass4nfv from branch 'master'
  - Modify download url for lxc image

    JIRA: COMPASS-607

    Download lxc image from a local server in huawei
    lab to avoid lxc pre-staged failure.

    Change-Id: Ia941d9e883ab5a4ff9c839e65e53703c6c237461
    Signed-off-by: Harry Huang <huangxiangyu5@huawei.com>

diff --git a/docs/submodules/compass4nfv b/docs/submodules/compass4nfv
index 27b030f..c93bdd4 160000 (submodule)
--- a/docs/submodules/compass4nfv
+++ b/docs/submodules/compass4nfv
@@ -1 +1 @@
-Subproject commit 27b030fb5cf3f779a5d3af2d9081dc22950f5233
+Subproject commit c93bdd489e9f8270b69f19ee233ebd82aa708b80