Upgrade dependencies to clear security issues

A bit of consolidation too - which could use a lot more work. These
were simple security upgrades for fixes identified by LF weekly LCM job.
Added some missing license headers.

Issue-ID: POLICY-507
Change-Id: If285b0f95d30a1084c9363bf6a41b48d52fb3aff
Signed-off-by: Pamela Dragosh <pdragosh@research.att.com>
diff --git a/PolicyEngineClient/pom.xml b/PolicyEngineClient/pom.xml
index 722c994..3703ad1 100644
--- a/PolicyEngineClient/pom.xml
+++ b/PolicyEngineClient/pom.xml
@@ -3,7 +3,7 @@
   ============LICENSE_START=======================================================
   ONAP Policy Engine
   ================================================================================
-  Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
+  Copyright (C) 2017-2018 AT&T Intellectual Property. All rights reserved.
   ================================================================================
   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
@@ -42,7 +42,7 @@
 		<dependency>
 			<groupId>org.apache.httpcomponents</groupId>
 			<artifactId>httpclient</artifactId>
-			<version>4.5</version>
+			<version>${httpclient.version}</version>
 		</dependency>
 	</dependencies>
 	<build>