Update git submodules

* Update docs/submodules/snaps from branch 'stable/euphrates'
  - Avoid checking Keystone v3 domains when using API v2.0

    Introducing a version check to avoid checking keystone domains,
    which are an auth API v3 feature, when only auth API v2.0 is
    being used.

    Change-Id: I220c6637e5f65124e5dbe7d5246490c3986b7a66
    Signed-off-by: Georg Kunz <georg.kunz@ericsson.com>

diff --git a/docs/submodules/snaps b/docs/submodules/snaps
index 2a09f41..fd18b67 160000 (submodule)
--- a/docs/submodules/snaps
+++ b/docs/submodules/snaps
@@ -1 +1 @@
-Subproject commit 2a09f4166562c1a91410a246d4ab08f0d5d71039
+Subproject commit fd18b6790cd9b59851bce6746cc83f27d3e18e4f