Update git submodules

* Update docs/submodules/snaps from branch 'stable/fraser'
  - Adding assertion message to test validation.

    Change-Id: I609d09ed8b4f75baeb1ad5454c9ddde9e996a3fe
    Signed-off-by: spisarski <s.pisarski@cablelabs.com>

diff --git a/docs/submodules/snaps b/docs/submodules/snaps
index e608a91..844c049 160000 (submodule)
--- a/docs/submodules/snaps
+++ b/docs/submodules/snaps
@@ -1 +1 @@
-Subproject commit e608a9113f5df4da58c411e4e30c9ea25903ae4a
+Subproject commit 844c049771c5b66eb7bd77e6f18f321674689d54