Update git submodules

* Update docs/submodules/snaps from branch 'master'
  - Sync requirements with OpenStack Pike

    OPNFV F-release is built on top of OpenStack Pike.
    Functest depends on SNAPS and requires this update.

    It conforms with the requirement management cleant for E-release [1].

    [1] https://wiki.opnfv.org/display/functest/Requirements+management

    Change-Id: Ifff3db55f8b2f03a91b43fb542328300c7b7b4a6
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/snaps b/docs/submodules/snaps
index 08ebe69..ff6141a 160000 (submodule)
--- a/docs/submodules/snaps
+++ b/docs/submodules/snaps
@@ -1 +1 @@
-Subproject commit 08ebe69c1d2e29aa02efd59f58dbbc0be4f9cd37
+Subproject commit ff6141ac35b4e0abd551c4d1f08a1e62ab538ec3