Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Calculate checksum for input VNF

    This patch adds checksum information inside ONAP related test case run
    results. The checksum is produced by the VNF input which can either be
    a CSAR file or an archive of Heat templates.

    Change-Id: I0ed58bdc9cc4031da08fd2ac220ef294520ef447
    Signed-off-by: Stamatis Katsaounis <mokats@intracom-telecom.com>

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index 0856c3a..b4e6a75 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit 0856c3ab2083ed8b8f16572c0f0b249aab203e69
+Subproject commit b4e6a756ebeb019048cb03a0562534870b772cae