Update git submodules

* Update docs/submodules/snaps from branch 'master'
  - Check dev_os_env_file exists before loading it

    The testcases should work even if no specific metadata are set.

    Change-Id: I3fa6aea3588f37946a847042903f313e33a728f8
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/snaps b/docs/submodules/snaps
index e6ec376..cdcf4e4 160000 (submodule)
--- a/docs/submodules/snaps
+++ b/docs/submodules/snaps
@@ -1 +1 @@
-Subproject commit e6ec3766be49d69a44ca1e1348bbf5e6ed692c84
+Subproject commit cdcf4e4b977ad2a7ccbe18d99302f26367623ced