Update git submodules

* Update docs/submodules/snaps from branch 'master'
  - Fixed stack create status check on error.

    Was checking for the status string of "ERROR" when "CREATE_FAILED"
    should have been used. This bug caused the heat stack test to hang
    instead of raising an exception.

    Change-Id: I91e04d58bed083fd8b93ec908c766c0ddc4828de
    Signed-off-by: spisarski <s.pisarski@cablelabs.com>

diff --git a/docs/submodules/snaps b/docs/submodules/snaps
index 4ad9342..7e24138 160000 (submodule)
--- a/docs/submodules/snaps
+++ b/docs/submodules/snaps
@@ -1 +1 @@
-Subproject commit 4ad9342789eb54b91147533691e99270ccd9cca1
+Subproject commit 7e241389c1f6f2366f7d8bef29eae938aefa4936