Update git submodules

* Update docs/submodules/snaps from branch 'master'
  - Created new class GlanceException.

    Raising GlanceException in glance_utils.py instead of Exception.

    JIRA: SNAPS-126

    Change-Id: I11b2d9a1ff439c1a4a52b4be30584fe8af877c73
    Signed-off-by: spisarski <s.pisarski@cablelabs.com>

diff --git a/docs/submodules/snaps b/docs/submodules/snaps
index de6536f..39328c7 160000 (submodule)
--- a/docs/submodules/snaps
+++ b/docs/submodules/snaps
@@ -1 +1 @@
-Subproject commit de6536ff2ba4faa1a3d4ed27e93d692cae20e5d2
+Subproject commit 39328c7d6f0582124b61a6c18fa10d8d245eecf2