Update git submodules

* Update docs/submodules/snaps from branch 'master'
  - Making test user password dynamic for testing against secure pods.

    Change-Id: I7c281062fc89a2ff4721e6bee9e90042c59273c5
    Signed-off-by: spisarski <s.pisarski@cablelabs.com>

diff --git a/docs/submodules/snaps b/docs/submodules/snaps
index 3b758ac..815a212 160000 (submodule)
--- a/docs/submodules/snaps
+++ b/docs/submodules/snaps
@@ -1 +1 @@
-Subproject commit 3b758ac913b0805eb4c7817efebd167adbbf9325
+Subproject commit 815a21216c6df1a33eff7a5521ee0b08f4696822