Update IT tests for JDK 17

* switch some BeanShell scripts to Groovy to avoid some
  unneeded/unwanted reflection
* update m-invoker-p for Groovy
* update m-war-p in e2e for XStream
* switch groovy-m-p to m-antrun-p in staleness-check-2
  to avoid the old Groovy version

Author: tbroyer

pom.xml

@@ -212,7 +212,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-invoker-plugin</artifactId>
-        <version>3.1.0</version>
+        <version>3.2.2</version>
         <executions>
           <execution>
             <goals>
@@ -233,7 +233,7 @@
             <artifact>org.apache.maven.plugins:maven-compiler-plugin:3.8.0:maven-plugin</artifact>
             <artifact>org.apache.maven.plugins:maven-source-plugin:3.0.1:maven-plugin</artifact>
             <artifact>org.codehaus.mojo:build-helper-maven-plugin:3.0.0:maven-plugin</artifact>
-            <artifact>org.codehaus.gmaven:groovy-maven-plugin:2.0:maven-plugin</artifact>
+            <artifact>org.apache.maven.plugins:maven-antrun-plugin:3.0.0:maven-plugin</artifact>
             <artifact>com.google.guava:guava:19.0</artifact>
             <artifact>com.google.guava:guava-gwt:19.0</artifact>
             <artifact>com.google.auto.value:auto-value:1.6.2</artifact>

src/it/e2e/pom.xml

@@ -87,6 +87,11 @@
             </execution>
           </executions>
         </plugin>
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-war-plugin</artifactId>
+          <version>3.3.2</version>
+        </plugin>
       </plugins>
     </pluginManagement>
   </build>

src/it/e2e/postbuild.bsh renamed to src/it/e2e/postbuild.groovy

@@ -1,2 +1,2 @@
 invoker.goals.1 = prepare-package
-invoker.goals.2 = groovy:execute prepare-package
+invoker.goals.2 = antrun:run prepare-package

src/it/gwt-app/postbuild.bsh renamed to src/it/gwt-app/postbuild.groovy

@@ -43,17 +43,17 @@
         </configuration>
       </plugin>
       <plugin>
-        <groupId>org.codehaus.gmaven</groupId>
-        <artifactId>groovy-maven-plugin</artifactId>
-        <version>2.0</version>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-antrun-plugin</artifactId>
+        <version>3.0.0</version>
         <executions>
           <execution>
             <id>default-cli</id>
             <configuration>
-              <source><![CDATA[
-                def f = new File('src/main/java/it/test/client/Test.ui.xml')
-                f.text = f.text.replace('Hello World!', 'Bonjour le monde&#160;!')
-              ]]></source>
+              <target>
+                <replace file="src/main/java/it/test/client/Test.ui.xml"
+                         token="Hello World!" value="Bonjour le monde&#160;!" />
+              </target>
             </configuration>
           </execution>
         </executions>