Update git submodules

* Update docs/submodules/snaps from branch 'stable/euphrates'
  - Fixed test names.

    Copy/paste issue changed nova to heat.

    Change-Id: Ib75fcea4c87375f615862e0542569c8e3d9675e8
    Signed-off-by: spisarski <s.pisarski@cablelabs.com>
    (cherry picked from commit 1ac3fefd616758779fc1489b5fee8689ec2487d9)

diff --git a/docs/submodules/snaps b/docs/submodules/snaps
index 02cbd9d..019dc36 160000 (submodule)
--- a/docs/submodules/snaps
+++ b/docs/submodules/snaps
@@ -1 +1 @@
-Subproject commit 02cbd9d2dfdf59374e203d51df33d50f4398b234
+Subproject commit 019dc3609a1e33eaa4cc07367502cfc140e099b7