Update git submodules

* Update docs/submodules/policy/parent.git from branch 'master'
  to 6eec8757733a8b6ff366b1980daff23323302a05
  - Fix last documentation warnings

    Had to add toctree to remove warnings. Do not seem to like the
    fact that an .rst is referenced via a label.

    Removed amsterdam controller and added frankfurt controller.

    Issue-ID: POLICY-2511
    Change-Id: I5fb887b3a1d26a543c844d6baa34b3fa0e506f0a
    Signed-off-by: Pamela Dragosh <pdragosh@research.att.com>

diff --git a/docs/submodules/policy/parent.git b/docs/submodules/policy/parent.git
index 2faef7b..6eec875 160000 (submodule)
--- a/docs/submodules/policy/parent.git
+++ b/docs/submodules/policy/parent.git
@@ -1 +1 @@
-Subproject commit 2faef7b09090b56a250a1883ae6b44feed17a3e1
+Subproject commit 6eec8757733a8b6ff366b1980daff23323302a05