Update git submodules

* Update docs/submodules/policy/engine.git from branch 'master'
  to ff9a74cf320a5f092ca4135375b5b80e35b441b1
  - Merge "Reformat ONAP-SDK-APP test cases"
  - Reformat ONAP-SDK-APP test cases

    Reformat test cases to follow ONAP style
    https://wiki.onap.org/display/DW/Java+code+style

    Format changes mainly consist of conversions of tabs to 4 spaces

    Samsung modifications copyrights added

    Issue-ID: POLICY-1506
    Change-Id: I71ddf1137f4ab6b84474e85b6c521daf07c9beee
    Signed-off-by: kaihlavi <l.kaihlavirt@partner.samsung.com>

diff --git a/docs/submodules/policy/engine.git b/docs/submodules/policy/engine.git
index 836a109..ff9a74c 160000 (submodule)
--- a/docs/submodules/policy/engine.git
+++ b/docs/submodules/policy/engine.git
@@ -1 +1 @@
-Subproject commit 836a109dec4b0aaf69292b3daa479b2a55e9e5b2
+Subproject commit ff9a74cf320a5f092ca4135375b5b80e35b441b1