Use the correct arguments when run with jdk9

Motivation:

We need to pass special arguments to run with jdk9 as otherwise some tests will not be able to run.

Modifications:

Allow to define extra arguments when running with jdk9

Result:

Tests pass with jdk9

handler/pom.xml

@@ -26,6 +26,11 @@
   <artifactId>netty-handler</artifactId>
   <packaging>jar</packaging>
 
+  <properties> 
+    <!-- Needed for SelfSignedCertificate -->
+    <argLine.java9.extras>--add-exports java.base/sun.security.x509=ALL-UNNAMED</argLine.java9.extras>
+  </properties>
+
   <name>Netty/Handler</name>
 
   <dependencies>

pom.xml

@@ -72,8 +72,9 @@
     <profile>
       <id>java9</id>
       <properties>
+        <argLine.java9.extras></argLine.java9.extras>
         <!-- Export some stuff which is used during our tests -->
-        <argLine.java9>--add-modules java.xml.bind --add-exports java.base/sun.security.x509=ALL-UNNAMED</argLine.java9>
+        <argLine.java9>--add-modules java.xml.bind ${argLine.java9.extras}</argLine.java9>
         <!-- Not use alpn agent as Java9 supports alpn out of the box -->
         <argLine.alpnAgent />
         <!-- This is needed as earlier ASM versions not support java9 -->

testsuite/pom.xml

@@ -88,6 +88,8 @@
 
   <properties>
     <skipAutobahnTestsuite>false</skipAutobahnTestsuite>
+    <!-- Needed for SSL tests as these use the SelfSignedCertificate --> 
+    <argLine.java9.extras>--add-exports java.base/sun.security.x509=ALL-UNNAMED</argLine.java9.extras>
   </properties>
 
   <profiles>

transport-native-epoll/pom.xml

@@ -28,6 +28,8 @@
 
   <properties>
     <jni.compiler.args.ldflags>LDFLAGS=-Wl,--no-as-needed -lrt</jni.compiler.args.ldflags>
+    <!-- Needed by the native transport as we need the memoryAddress of the ByteBuffer -->
+    <argLine.java9.extras>--add-opens=java.base/java.nio=ALL-UNNAMED</argLine.java9.extras>
   </properties>
 
   <dependencies>