Create tests and test-sources jars

There are a number of useful classes (MockFluentd) in the test code which are
only accessible if the project builds and distributes test jars.

Author: Henning Schmiedehausen

pom.xml

@@ -115,12 +115,13 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-source-plugin</artifactId>
-        <version>2.1.2</version>
+        <version>3.0.1</version>
         <executions>
           <execution>
             <id>attach-sources</id>
             <goals>
-              <goal>jar</goal>
+              <goal>jar-no-fork</goal>
+              <goal>test-jar-no-fork</goal>
             </goals>
           </execution>
         </executions>
@@ -151,6 +152,20 @@
           <argLine>-Xmx512M</argLine>
         </configuration>
       </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-jar-plugin</artifactId>
+        <version>3.1.1</version>
+        <executions>
+          <execution>
+            <id>default</id>
+            <phase>package</phase>
+            <goals>
+              <goal>test-jar</goal>
+            </goals>
+          </execution>
+        </executions>
+      </plugin>
     </plugins>
   </build>