Update git submodules

* Update docs/submodules/compass4nfv from branch 'stable/euphrates'
  - Bug fix for offline deployment of euphrates branch

    JIRA: -

    For offline deployment, there is no need to fix the pandas and
    python-ldap version.

    Change-Id: I30fa1f2af8ad13e115c0078c4f33102936bdd71d
    Signed-off-by: Yifei Xue <xueyifei@huawei.com>

diff --git a/docs/submodules/compass4nfv b/docs/submodules/compass4nfv
index 1be06d2..d88d215 160000 (submodule)
--- a/docs/submodules/compass4nfv
+++ b/docs/submodules/compass4nfv
@@ -1 +1 @@
-Subproject commit 1be06d2cdf5ae5308b4efdadd97a59021738f055
+Subproject commit d88d2158f94c72639b3f0ec635553bc0a7c82755