revert using extensions in any module

It fixes the issue that Maven try to resolve the plugin before the reactor build even starts.
Maven needs to load extensions during the project model building phase, which happens before any module is compiled.

Author: manolo

vaadin-platform-test/pom.xml

@@ -164,7 +164,13 @@
             <plugin>
                 <groupId>com.vaadin</groupId>
                 <artifactId>vaadin-maven-plugin</artifactId>
-                <extensions>true</extensions>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>prepare-frontend</goal>
+                        </goals>
+                    </execution>
+                </executions>
             </plugin>
         </plugins>
     </build>
@@ -247,6 +253,17 @@
                             </execution>
                         </executions>
                     </plugin>
+                    <plugin>
+                        <groupId>com.vaadin</groupId>
+                        <artifactId>vaadin-maven-plugin</artifactId>
+                        <executions>
+                            <execution>
+                                <goals>
+                                    <goal>prepare-frontend</goal>
+                                </goals>
+                            </execution>
+                        </executions>
+                    </plugin>
                     <plugin>
                         <artifactId>maven-antrun-plugin</artifactId>
                         <version>3.0.0</version>
@@ -266,5 +283,29 @@
             </build>
         </profile>
 
+        <profile>
+            <!-- Production mode is activated using -Pproduction -->
+            <id>production</id>
+            <activation>
+                <property>
+                    <name>vaadin.productionMode</name>
+                </property>
+            </activation>
+            <build>
+                <plugins>
+                    <plugin>
+                        <groupId>com.vaadin</groupId>
+                        <artifactId>vaadin-maven-plugin</artifactId>
+                        <executions>
+                            <execution>
+                                <goals>
+                                    <goal>build-frontend</goal>
+                                </goals>
+                            </execution>
+                        </executions>
+                    </plugin>
+                </plugins>
+            </build>
+        </profile>
     </profiles>
 </project>