Update git submodules

* Update docs/submodules/policy/parent.git from branch 'master'
  to af35b6a245e1587a3f149746c043fc4520daecaa
  - Add more textual explanation in api doc

    Added more textual explanation and tables for
    downloading sample policies and preloaded policy types.
    Also added sample curl commands for api calls.

    Issue-ID: POLICY-1680
    Change-Id: Ia98e37679ae8e632da9d1f7308e156f722648faf
    Signed-off-by: Chenfei Gao <cgao@research.att.com>

diff --git a/docs/submodules/policy/parent.git b/docs/submodules/policy/parent.git
index 55e1f55..af35b6a 160000 (submodule)
--- a/docs/submodules/policy/parent.git
+++ b/docs/submodules/policy/parent.git
@@ -1 +1 @@
-Subproject commit 55e1f559eb898e470bb7af9f83fb0ac23069bf34
+Subproject commit af35b6a245e1587a3f149746c043fc4520daecaa