Update git submodules

* Update docs/submodules/stor4nfv from branch 'master'
  - Remove check_envs call

    It was removed because it was useless [1].
    [1] https://build.opnfv.org/ci/view/functest/job/functest-compass-virtual-daily-fraser/772/console

    Change-Id: I7620e959f756bb77e65dd1f770ecdb40e7042629
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/stor4nfv b/docs/submodules/stor4nfv
index d65e22d..6b637d1 160000 (submodule)
--- a/docs/submodules/stor4nfv
+++ b/docs/submodules/stor4nfv
@@ -1 +1 @@
-Subproject commit d65e22d27ab305d38059046dae60d7a66ff4a4e0
+Subproject commit 6b637d11c99450ed0a1f3b9a5231ccea82e5cd5b