Add plugin for formatting

Makes it easy from the command line to clean up whole submodules.
Notably for policy/engine.

Unfortunately we will have to copy the onap-java-formatter.xml to each
project repo. Maven can't seem to find the file.

Issue-ID: POLICY-2145
Change-Id: Ic905be8c33fd89e3bd2be072d3670aad7a4fac2b
Signed-off-by: Pamela Dragosh <pdragosh@research.att.com>
diff --git a/pom.xml b/pom.xml
index e8a55d4..fd85b3d 100644
--- a/pom.xml
+++ b/pom.xml
@@ -37,4 +37,45 @@
     <modules>
         <module>integration</module>
     </modules>
+
+    <build>
+        <pluginManagement>
+            <plugins>
+                <!--
+                Using https://code.revelc.net/formatter-maven-plugin/ for Eclipse formatter
+                Using https://github.com/diffplug/spotless/tree/master/plugin-maven for import order
+                Use in combination to rewrite code and imports, then checkstyle
+
+                mvn formatter:format spotless:apply process-sources
+                -->
+                <plugin>
+                    <groupId>net.revelc.code.formatter</groupId>
+                    <artifactId>formatter-maven-plugin</artifactId>
+                    <version>2.8.1</version>
+                    <configuration>
+                        <configFile>${project.parent.basedir}/onap-java-formatter.xml</configFile>
+                    </configuration>
+                    <!-- https://code.revelc.net/formatter-maven-plugin/
+                         use mvn formatter:format to rewrite source files
+                         use mvn formatter:validate to validate source files -->
+                </plugin>
+                <plugin>
+                    <groupId>com.diffplug.spotless</groupId>
+                    <artifactId>spotless-maven-plugin</artifactId>
+                    <version>1.18.0</version>
+                    <configuration>
+                        <java>
+                            <importOrder>
+                                <order>com,java,javax,org</order>
+                            </importOrder>
+                        </java>
+                    </configuration>
+                    <!-- https://github.com/diffplug/spotless/tree/master/plugin-maven
+                         use mvn spotless:apply to rewrite source files
+                         use mvn spotless:check to validate source files -->
+                </plugin>
+            </plugins>
+        </pluginManagement>
+    </build>
+
 </project>