Update git submodules

* Update docs/submodules/compass4nfv from branch 'master'
  - Enable neutron port trunk

    JIRA: COMPASS-571

    The network trunk service allows multiple networks to be connected to an
    instance using a single virtual NIC (vNIC). Multiple networks can be presented
    to an instance by connecting it to a single port. This is a highly relevant
    feature for VNFs and hence for OPNFV as a reference NFVI.

    This patch is about enabling the trunk port feature in Compass deployments.

    Change-Id: I270c3f1d5e4af99578c8e1882fae12ddddaabe78
    Signed-off-by: Yifei Xue <xueyifei@huawei.com>

diff --git a/docs/submodules/compass4nfv b/docs/submodules/compass4nfv
index a3e5685..2c93fa2 160000 (submodule)
--- a/docs/submodules/compass4nfv
+++ b/docs/submodules/compass4nfv
@@ -1 +1 @@
-Subproject commit a3e5685e01696a85550c13ef7326b3103b8123ff
+Subproject commit 2c93fa28f1f1e78f4135f096f0c59e82963fd847