[MSHARED-1327] Change output directory default in AbstractMavenReport

The output directory now defaults to ${project.build.directory}/reports
instead of ${project.reporting.outputDirectory}.
This represents a clear separatation between standalone invocation compared to
site generation.

This closes #26

Author: kriegaex

src/it/use-as-direct-mojo-markup/verify.groovy

@@ -17,7 +17,7 @@
  * under the License.
  */
 
-File site = new File( basedir, 'target/site/' )
+File site = new File( basedir, 'target/reports/' )
 
 File f = new File( site, 'custom-report.xdoc' );
 assert f.exists();
@@ -31,4 +31,4 @@ f = new File( site, 'external/report.html' );
 assert f.exists();
 assert f.text.contains( '<h1>External Report</h1>' );
 
-return true;
+return true;

src/it/use-as-direct-mojo/verify.groovy

@@ -17,7 +17,7 @@
  * under the License.
  */
 
-File site = new File( basedir, 'target/site/' )
+File site = new File( basedir, 'target/reports/' )
 
 File f = new File( site, 'custom-report.html' );
 assert f.exists();

src/main/java/org/apache/maven/reporting/AbstractMavenReport.java

@@ -84,7 +84,7 @@ public abstract class AbstractMavenReport extends AbstractMojo implements MavenM
      * user-defined mojo parameter with a default value) to generate multi-page reports or external reports with the
      * main output file (entry point) denoted by {@link #getOutputName()}.
      */
-    @Parameter(defaultValue = "${project.reporting.outputDirectory}", readonly = true, required = true)
+    @Parameter(defaultValue = "${project.build.directory}/reports", readonly = true, required = true)
     protected File outputDirectory;
 
     /**