Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  to 73febf900b85dae4d953389696f3a78cf8267816
  - Failed to upload results to ONAP portal

    The results.json file generated by running
    'dovetail run --testsuite xxx' is different from the one
    generated by running 'dovetail run --testcase xxx'.
    The former can be uploaded to ONAP portal successfully
    but the latter one can't.
    The main reason is that the latter one lacking of 'vnf_type'.
    Keep the results.json with the same format for both running
    one test suite or several test cases.

    JIRA: DOVETAIL-769

    Change-Id: I46af84f9f229f9e601439f68c9ed9df9477d002b
    Signed-off-by: Panagiotis Karalis <pkaralis@intracom-telecom.com>

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index f170bf4..73febf9 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit f170bf4205fd75db96b84a685b931904f4dbab93
+Subproject commit 73febf900b85dae4d953389696f3a78cf8267816