Build on Java 9

Updated couple incompatible Maven plugins, removed usage of inaccessible
class.

Author: lutovich

driver/src/main/java/org/neo4j/driver/internal/util/CertificateTool.java

@@ -30,7 +30,7 @@
 import java.security.cert.Certificate;
 import java.security.cert.CertificateException;
 import java.security.cert.CertificateFactory;
-import javax.xml.bind.DatatypeConverter;
+import java.util.Base64;
 
 /**
  * A tool related to save, load certs, etc.
@@ -89,7 +89,7 @@ public static void saveX509Cert( Certificate[] certs, File certFile ) throws Gen
 
         for ( Certificate cert : certs )
         {
-            String certStr = DatatypeConverter.printBase64Binary( cert.getEncoded() ).replaceAll( "(.{64})", "$1\n" );
+            String certStr = Base64.getEncoder().encodeToString( cert.getEncoded() ).replaceAll( "(.{64})", "$1\n" );
 
             writer.write( BEGIN_CERT );
             writer.newLine();

pom.xml

@@ -133,7 +133,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-source-plugin</artifactId>
-        <version>2.4</version>
+        <version>3.0.1</version>
         <executions>
           <execution>
             <id>attach-sources</id>
@@ -146,7 +146,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-javadoc-plugin</artifactId>
-        <version>2.9.1</version>
+        <version>3.0.0</version>
         <configuration>
           <charset>UTF-8</charset>
           <docencoding>UTF-8</docencoding>
@@ -157,7 +157,7 @@
             <script>hljs.initHighlightingOnLoad();</script>
           ]]></top>
           <!-- Required for Java 8u121 or later. See https://github.com/neo4j/neo4j-java-driver/pull/318  -->
-          <additionalparam>--allow-script-in-comments</additionalparam>
+          <additionalOptions>--allow-script-in-comments</additionalOptions>
         </configuration>
         <executions>
           <execution>