upgraded m-plugin-p to 3.5.1, removed report versions

Author: hboutemy

pom.xml

@@ -379,7 +379,7 @@ limitations under the License.
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-plugin-plugin</artifactId>
-          <version>3.5</version>
+          <version>3.5.1</version>
         </plugin>
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
@@ -491,7 +491,6 @@ limitations under the License.
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-project-info-reports-plugin</artifactId>
-        <version>2.9</version><!-- TODO remove version once parent does not hardcode it -->
         <reportSets>
           <reportSet>
             <reports>
@@ -622,7 +621,6 @@ limitations under the License.
           <plugin>
             <groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-gpg-plugin</artifactId>
-            <version>1.6</version>
             <configuration>
               <passphrase>${gpg.passphrase}</passphrase>
             </configuration>