Update git submodules

* Update docs/submodules/snaps from branch 'master'
  - Merge "Added keypair config for key file deletion."
  - Added keypair config for key file deletion.

    Added KeypairSetting attribute named 'delete_on_clean' which is used
    to override the keypair creator's logic for deleting its associated
    public/private key files.

    JIRA: SNAPS-105

    Change-Id: I337db99daa6bf7d4b42e8729a92a4baef5c73140
    Signed-off-by: spisarski <s.pisarski@cablelabs.com>

diff --git a/docs/submodules/snaps b/docs/submodules/snaps
index e629796..d336b42 160000 (submodule)
--- a/docs/submodules/snaps
+++ b/docs/submodules/snaps
@@ -1 +1 @@
-Subproject commit e629796ead718b80fe7be15e6a6c860b6183ffb6
+Subproject commit d336b42e1476f05dedad3f6e6653f73987154c87