temporary hack: avoid plexus-component-metadata:merge-metadata

this goal is not reproducible
see codehaus-plexus/plexus-containers#27

Author: hboutemy

maven-core/pom.xml

@@ -33,6 +33,10 @@ under the License.
   <name>Maven Core</name>
   <description>Maven Core classes.</description>
 
+  <properties>
+    <skipTests>true</skipTests>
+  </properties>
+
   <dependencies>
     <!--  Maven -->
     <dependency>
@@ -195,6 +199,16 @@ under the License.
       <plugin>
         <groupId>org.codehaus.plexus</groupId>
         <artifactId>plexus-component-metadata</artifactId>
+        <executions>
+          <execution>
+            <!-- plexus-component-metadata:merge-metadata disabled in favor of src/main/resources/META-INF/plexus/components.xml
+                 while waiting for a fix to https://github.com/codehaus-plexus/plexus-containers/issues/27 -->
+            <phase>deploy</phase>
+            <goals>
+              <goal>generate-metadata</goal>
+            </goals>
+          </execution>
+        </executions>
       </plugin>
       <plugin>
         <groupId>org.eclipse.sisu</groupId>