Fix failing powermock tests

The version of javassist coming from opendaylight is not working correctly
with powermock. Adding a test scoped dependency for a working version of
javassist.

Test classes added in this commit are not new, they were temporarily
removed as part of https://gerrit.onap.org/r/#/c/79046/

Change-Id: I193873c0d4abd7b11592a95bff9a6b07cf2d7191
Signed-off-by: Patrick Brady <patrick.brady@att.com>
Issue-ID: APPC-1277
diff --git a/appc-dg/appc-dg-shared/appc-dg-dependency-model/pom.xml b/appc-dg/appc-dg-shared/appc-dg-dependency-model/pom.xml
index b52e7b1..085f65b 100644
--- a/appc-dg/appc-dg-shared/appc-dg-dependency-model/pom.xml
+++ b/appc-dg/appc-dg-shared/appc-dg-dependency-model/pom.xml
@@ -2,7 +2,7 @@
   ============LICENSE_START=======================================================
   ONAP : APPC
   ================================================================================
-  Copyright (C) 2017-2018 AT&T Intellectual Property. All rights reserved.
+  Copyright (C) 2017-2019 AT&T Intellectual Property. All rights reserved.
   Copyright (C) 2017 Amdocs
   ================================================================================
   Licensed under the Apache License, Version 2.0 (the "License");
@@ -98,6 +98,12 @@
       <scope>test</scope>
     </dependency>
     <dependency>
+        <groupId>org.javassist</groupId>
+        <artifactId>javassist</artifactId>
+        <version>3.22.0-GA</version>
+        <scope>test</scope>
+      </dependency>
+    <dependency>
       <groupId>org.onap.appc</groupId>
       <artifactId>appc-dg-domain-model-lib</artifactId>
       <version>${project.version}</version>