Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Use git commit id for refstack-client"
  - Use git commit id for refstack-client

    Functest should be based on fixed versions of projects which are out
    of OPNFV. It selects the last git commit as refstack-client hasn't
    defined any tag or branch.

    Change-Id: Id7c5ecb0ef88fd1a2b8f34ddfc22c87b7f78c8d4
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 3241868..90f7a7d 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 3241868d79a4b9f951e920bcfcdbd877c1235cb5
+Subproject commit 90f7a7de0d911c6c8cc472add5f7cde163bf148e