Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Remove get_repo_tag"
  - Remove get_repo_tag

    Not in use after removal of multisite support [1].

    [1] https://gerrit.opnfv.org/gerrit/#/c/39569/

    Change-Id: I1346c78743690a2e5279d3b1883501dfe19078e3
    Signed-off-by: Juha Kosonen <juha.kosonen@nokia.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 94442c0..6dac04c 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 94442c0ea7245b0f69da547c1924b0a9325f21cc
+Subproject commit 6dac04c5556db7fa2dc4088116b91509f4e73084