making POM more fool proof, in case of mvn hudson-dev:run at the wrong level

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@22860 71c3de6d-444a-0410-be80-ed276b4c234a

pom.xml

@@ -188,6 +188,16 @@ THE SOFTWARE.
         </executions>
       </plugin>
 
+      <plugin>
+        <!--
+          Since some developers try to run hudson-dev:run from main, define it here so that at least the plugin resolves.
+          This enables us to report a better error message.
+        -->
+        <groupId>org.jvnet.hudson.tools</groupId>
+        <artifactId>maven-hudson-dev-plugin</artifactId>
+        <version>6.1.7</version>
+      </plugin>
+
       <!--<plugin>
         <groupId>org.jvnet.fix1600</groupId>
         <artifactId>fix1600</artifactId>