Separated out host anti-affinity as a plugin.

plugins/affinity-group-processors/host-anti-affinity/pom.xml

@@ -0,0 +1,33 @@
+<!--
+  Licensed to the Apache Software Foundation (ASF) under one
+  or more contributor license agreements. See the NOTICE file
+  distributed with this work for additional information
+  regarding copyright ownership. The ASF licenses this file
+  to you 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.
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <artifactId>cloud-plugin-host-anti-affinity</artifactId>
+  <name>Apache CloudStack Plugin - Host Anti-Affinity Processor</name>
+  <parent>
+    <groupId>org.apache.cloudstack</groupId>
+    <artifactId>cloudstack-plugins</artifactId>
+    <version>4.2.0-SNAPSHOT</version>
+    <relativePath>../../pom.xml</relativePath>
+  </parent>
+  <build>
+    <defaultGoal>install</defaultGoal>
+    <sourceDirectory>src</sourceDirectory>    
+  </build>  
+</project>

plugins/pom.xml

@@ -36,6 +36,7 @@
     <module>api/rate-limit</module>
     <module>api/discovery</module>
     <module>acl/static-role-based</module>
+	<module>affinity-group-processors/host-anti-affinity</module>
     <module>deployment-planners/user-concentrated-pod</module>
     <module>deployment-planners/user-dispersing</module>
     <module>host-allocators/random</module>