Update git submodules

* Update docs/submodules/snaps from branch 'master'
  - Fixed vm instance instantiation from Heat when using nested resources

    * Simplified the configuration of file resources
    * Added integration test

    JIRA: SNAPS-255

    Change-Id: I1065d9352865d7a9f946a5d9947e32e7340f20bc
    Signed-off-by: spisarski <s.pisarski@cablelabs.com>

diff --git a/docs/submodules/snaps b/docs/submodules/snaps
index c0aee4c..97cee57 160000 (submodule)
--- a/docs/submodules/snaps
+++ b/docs/submodules/snaps
@@ -1 +1 @@
-Subproject commit c0aee4c0d7620a32f5314ca938e4aca10c27adda
+Subproject commit 97cee572f017696415b212024fc28c85b892b0cd