Update git submodules

* Update docs/submodules/snaps from branch 'stable/euphrates'
  - Correct list of parameters

    CreateInstancePubPrivNetTests was moved to the openstack_staging_tests
    suite but with the wrong list of parameters. This fix corrects that.

    Change-Id: Id32cc19f2e6c4dfa5e0c07b83fd4911de208658c
    Signed-off-by: Cristina Pauna <cristina.pauna@enea.com>

diff --git a/docs/submodules/snaps b/docs/submodules/snaps
index 3bfdf2b..02cbd9d 160000 (submodule)
--- a/docs/submodules/snaps
+++ b/docs/submodules/snaps
@@ -1 +1 @@
-Subproject commit 3bfdf2b60da1f56294480e18d9b5c006b8859110
+Subproject commit 02cbd9d2dfdf59374e203d51df33d50f4398b234