Add superclasses for gson-jackson migration

Added common classes needed by other gson-jackson code.
Modified some logic to make it more maintainable or perform better.
Updated comments and spacing.
Fix another comment.
Moved gson classes from utils to a separate gson project.
Added GsonXxx annotations to mirror jackson annotations.
Removed unneeded dependencies from gson pom.
Removed old GsonMessage class from policy-endpoints.
Removed trailing spaces.
Updated licenses.
Removed more trailing spaces.
Removed unneeded checkstyle suppression file from utils.

Change-Id: I1a285500faeb0a0b6a1467d09b92ecd3cded713e
Issue-ID: POLICY-1428
Signed-off-by: Jim Hahn <jrh3@att.com>

1 files changed, 39 insertions, 0 deletions

diff --git a/gson/checkstyle-suppressions.xml b/gson/checkstyle-suppressions.xml
new file mode 100644
index 00000000..0705e0e6
--- /dev/null
+++ b/gson/checkstyle-suppressions.xml
@@ -0,0 +1,39 @@
+<?xml version="1.0"?>
+<!--
+  ============LICENSE_START=======================================================
+   Copyright (C) 2019 AT&T Technologies. 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.
+  You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+
+  SPDX-License-Identifier: Apache-2.0
+  ============LICENSE_END=========================================================
+-->
+
+<!--
+    NOTE:   The sole purpose of this supression file is to allow "$" in field and method
+            names so that the gson class tests can verify that those fields are ignored
+            when doing serialization and de-serialization.
+ -->
+
+<!DOCTYPE suppressions PUBLIC
+     "-//Puppy Crawl//DTD Suppressions 1.0//EN"
+     "http://www.puppycrawl.com/dtds/suppressions_1_0.dtd">
+
+<suppressions>
+  <suppress checks="MemberName"
+    files="AdapterTest.java|ClassWalkerTest.java"
+    lines="1-9999"/>
+  <suppress checks="MethodName"
+    files="AdapterTest.java"
+    lines="1-9999"/>
+</suppressions>