Update plugin version according to Maven team recommendations

Using recommended versions from https://cwiki.apache.org/confluence/display/MAVEN/Java+9+-+Jigsaw

Author: laurentgo

java/pom.xml

@@ -333,15 +333,15 @@
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-compiler-plugin</artifactId>
-          <version>3.2</version>
+          <version>3.6.2</version>
         </plugin>
         <plugin>
           <artifactId>maven-enforcer-plugin</artifactId>
-          <version>1.3.1</version>
+          <version>3.0.0-M1</version>
         </plugin>
         <plugin>
           <artifactId>maven-surefire-plugin</artifactId>
-          <version>2.17</version>
+          <version>2.20</version>
           <configuration>
             <enableAssertions>true</enableAssertions>
             <forkCount>${forkCount}</forkCount>
@@ -537,7 +537,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-javadoc-plugin</artifactId>
-        <version>2.9</version>
+        <version>3.0.0-M1</version>
         <reportSets>
           <reportSet><!-- by default, id = "default" -->
             <reports><!-- select non-aggregate reports -->