[MPOM-107] Upgrade to ASF Parent 18

Remove plugin versions already set by the parent

git-svn-id: https://svn.apache.org/repos/asf/maven/pom/trunk@1739522 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/maven/maven-archetype-bundles/pom.xml b/maven/maven-archetype-bundles/pom.xml
index be06691..56bef40 100644
--- a/maven/maven-archetype-bundles/pom.xml
+++ b/maven/maven-archetype-bundles/pom.xml
@@ -70,7 +70,6 @@
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-release-plugin</artifactId>
-          <version>2.3.2</version>
           <configuration>
             <tagBase>https://svn.apache.org/repos/asf/maven/archetypes/tags/</tagBase>
           </configuration>
diff --git a/maven/pom.xml b/maven/pom.xml
index 15431e1..4686ea8 100644
--- a/maven/pom.xml
+++ b/maven/pom.xml
@@ -902,7 +902,6 @@
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-site-plugin</artifactId>
-          <version>3.5.1</version>
           <configuration>
             <!-- for multi-modules site staging -->
             <topSiteURL>scm:svn:https://svn.apache.org/repos/infra/websites/production/maven/components/${maven.site.path}</topSiteURL>
@@ -961,13 +960,7 @@
         </plugin>
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
-          <artifactId>maven-project-info-reports-plugin</artifactId>
-          <version>2.8.1</version>
-        </plugin>
-        <plugin>
-          <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-release-plugin</artifactId>
-          <version>2.5.2</version>
           <configuration>
             <useReleaseProfiles>true</useReleaseProfiles>
             <releaseProfiles>apache-release</releaseProfiles>
@@ -980,12 +973,6 @@
           <artifactId>maven-toolchains-plugin</artifactId>
           <version>1.1</version>
         </plugin>
-        <!--remove when apache-parent is updated to ASF-18 -->
-        <plugin>
-          <groupId>org.apache.maven.plugins</groupId>
-          <artifactId>maven-gpg-plugin</artifactId>
-          <version>1.6</version>
-        </plugin>        
         <plugin>
           <groupId>org.codehaus.mojo</groupId>
           <artifactId>findbugs-maven-plugin</artifactId>