Update git submodules

* Update docs/submodules/policy/parent.git from branch 'master'
  to f9f78d1faadda4a2c6069e34646207297712f348
  - Update release-notes known issues
    
    For bug fix https://jira.onap.org/browse/POLICY-1872
    
    Issue-ID: POLICY-1875
    Change-Id: Ica5a251fce507262829d01bb0d49d39fa5c91f51
    Signed-off-by: Pamela Dragosh <pdragosh@research.att.com>
    
diff --git a/docs/submodules/policy/parent.git b/docs/submodules/policy/parent.git
index c68e73d..f9f78d1 160000
--- a/docs/submodules/policy/parent.git
+++ b/docs/submodules/policy/parent.git
@@ -1 +1 @@
-Subproject commit c68e73d68f840e81792e6ec51520900bfd3f0ea0
+Subproject commit f9f78d1faadda4a2c6069e34646207297712f348