[MNG-5561] Plugin relocation loses configuration

Previously, to locate plugin configuration in the project the plugin descriptor
was read and the GA were extracted. This always worked because the GA from the
model and the GA from plugin descriptor (plugin.xml) were identical. When a
plugin is relocated the target artifact is read, thus its plugin descriptor as
well. Naturally, the GA of new (relocated) does not correspond to the old
(static) one in the model. Therefore, the configuration is not found.
New approach is to use the original plugin GA to locate the configuration in
the model regardless of relocation.

maven-core/src/main/java/org/apache/maven/lifecycle/internal/DefaultMojoExecutionConfigurator.java

@@ -41,9 +41,9 @@ public class DefaultMojoExecutionConfigurator
     @Override
     public void configure( MavenProject project, MojoExecution mojoExecution, boolean allowPluginLevelConfig )
     {
-        String g = mojoExecution.getGroupId();
+        String g = mojoExecution.getPlugin().getGroupId();
 
-        String a = mojoExecution.getArtifactId();
+        String a = mojoExecution.getPlugin().getArtifactId();
 
         Plugin plugin = findPlugin( g, a, project.getBuildPlugins() );
 

maven-core/src/test/java/org/apache/maven/lifecycle/internal/stub/BuildPluginManagerStub.java

@@ -42,7 +42,7 @@ public PluginDescriptor loadPlugin( Plugin plugin, List<RemoteRepository> reposi
     public MojoDescriptor getMojoDescriptor( Plugin plugin, String goal, List<RemoteRepository> repositories,
                                              RepositorySystemSession session )
     {
-        return MojoExecutorStub.createMojoDescriptor( plugin.getKey() );
+        return MojoExecutorStub.createMojoDescriptor( plugin );
     }
 
     public ClassRealm getPluginRealm( MavenSession session, PluginDescriptor pluginDescriptor )

maven-core/src/test/java/org/apache/maven/lifecycle/internal/stub/MojoExecutorStub.java

@@ -21,6 +21,7 @@
 import org.apache.maven.lifecycle.internal.MojoExecutor;
 import org.apache.maven.lifecycle.internal.PhaseRecorder;
 import org.apache.maven.lifecycle.internal.ProjectIndex;
+import org.apache.maven.model.Plugin;
 import org.apache.maven.plugin.MojoExecution;
 import org.apache.maven.plugin.descriptor.MojoDescriptor;
 import org.apache.maven.plugin.descriptor.PluginDescriptor;
@@ -54,12 +55,14 @@ public void execute( MavenSession session, List<MojoExecution> mojoExecutions, P
     }
 
 
-    public static MojoDescriptor createMojoDescriptor( String mojoDescription )
+    public static MojoDescriptor createMojoDescriptor( Plugin plugin )
     {
         final PluginDescriptor descriptor = new PluginDescriptor();
-        descriptor.setArtifactId( mojoDescription );
+        descriptor.setGroupId( plugin.getGroupId() );
+        descriptor.setArtifactId( plugin.getArtifactId() );
+        descriptor.setPlugin( plugin );
+        descriptor.setVersion( plugin.getVersion() );
         final MojoDescriptor mojoDescriptor = new MojoDescriptor();
-        mojoDescriptor.setDescription( mojoDescription );
         mojoDescriptor.setPluginDescriptor( descriptor );
         return mojoDescriptor;
     }