Updated git submodules

Project: policy/engine master a6b8bc8875402ab721a8529926d01b2565d0f595

Addressing Technical Debt for POLICY-SDK-APP

* Using booleans true and false
* Using already predefined static strings
* Adding private constructors to hide implicit
* Adding empty constructor comment to satisfy SONAR
* Using single quotes for indexOf to use faster method
* Preferred use of .isEmpty()
* Ordering of public static synchronized syntax
* Removing commented out code
* Using an already defined constant
* Unnecessary declaration of runtime exceptions
* Unnecessary casts
* Unused variables and imports
* Unnecessary use of toString()
* Just using return vs storing into a local var and returning that
* Extra semicolons

Issue-ID: POLICY-482
Change-Id: I6b9dcc5211dd52895a8787239b9df3059928fa45
Signed-off-by: Pamela Dragosh <pdragosh@research.att.com>

diff --git a/docs/submodules/policy/engine.git b/docs/submodules/policy/engine.git
index 7a2924a..a6b8bc8 160000 (submodule)
--- a/docs/submodules/policy/engine.git
+++ b/docs/submodules/policy/engine.git
@@ -1 +1 @@
-Subproject commit 7a2924a2209bce7b0c578b67fd2310d12ccdb1f7
+Subproject commit a6b8bc8875402ab721a8529926d01b2565d0f595