Update git submodules

* Update docs/submodules/functest from branch 'stable/fraser'
  - Allow refs as vnf requirement versions

    Change-Id: I4079fa3641373eee40f8a876a2a525635f2752eb
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>
    (cherry picked from commit b039d8d4219bca73a5b86e03f34f27fbe655ec81)

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 3545d54..6079de9 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 3545d54a9ac4713d44168c800b171b8186fb4371
+Subproject commit 6079de9abe8af32f94fbdc40edc58fbc07a0dfe4