Update git submodules

* Update docs/submodules/snaps from branch 'master'
  - Merge "Added logging when a heat stack fails."
  - Added logging when a heat stack fails.

    Added the stack resource reason to the error logs for each
    resource who's status is 'CREATE_FAILED'. All resons will be
    output to debug.

    JIRA: SNAPS-190

    Change-Id: Ieb1cdb2089eb6e1c1a7c96c143b82af1b7a9efb7
    Signed-off-by: spisarski <s.pisarski@cablelabs.com>

diff --git a/docs/submodules/snaps b/docs/submodules/snaps
index 092d58d..15b7270 160000 (submodule)
--- a/docs/submodules/snaps
+++ b/docs/submodules/snaps
@@ -1 +1 @@
-Subproject commit 092d58de391b9f8523e87142ffc60e040796607d
+Subproject commit 15b7270542288263189abebcfa4f89c0245aaf8b