Rename the plugin-parent project to plugins-parent to be more consistent with plugins-site. It's the parent of all plugins.

git-svn-id: https://svn.apache.org/repos/asf/maven/maven-1/plugins/trunk@375409 13f79535-47bb-0310-9956-ffa450edef68

pdf/src/plugin-test/test01/project.xml

@@ -17,7 +17,7 @@
  */
  -->
 <project>
-  <extend>${basedir}/../../../../plugin-parent/project.xml</extend>
+  <extend>${basedir}/../../../../plugins-parent/project.xml</extend>
   <pomVersion>3</pomVersion>
   <id>test-maven-pdf-plugin-01</id>
   <name>Maven PDF Plugin Test 01</name>

pdf/src/plugin-test/test02/project.xml

@@ -17,7 +17,7 @@
  */
  -->
 <project>
-  <extend>${basedir}/../../../../plugin-parent/project.xml</extend>
+  <extend>${basedir}/../../../../plugins-parent/project.xml</extend>
   <pomVersion>3</pomVersion>
   <id>test-maven-pdf-plugin-02</id>
   <name>Maven PDF Plugin Test 02</name>