Update git submodules

* Update docs/submodules/snaps from branch 'master'
  - Refactor keystone endpoint tests to the proper test class.
    Also added documentation for those three tests.

    Change-Id: I38a728ba9e258a821341621978953e0529a0c1a1
    Signed-off-by: spisarski <s.pisarski@cablelabs.com>

diff --git a/docs/submodules/snaps b/docs/submodules/snaps
index 5718894..bb14b25 160000 (submodule)
--- a/docs/submodules/snaps
+++ b/docs/submodules/snaps
@@ -1 +1 @@
-Subproject commit 5718894fcfb3e44dd08435cf71d2f1094425bed5
+Subproject commit bb14b25047aabe1712aa34c0e2796e312b0b1af4