Docs: Reducing the amount of pivotal-specific gpcopy docs in the oss repo

gpdb-doc/dita/GPAdminGuide.ditamap

@@ -86,7 +86,7 @@
     <chapter href="admin_guide/managing/backup.ditamap" format="ditamap"/>
     <chapter href="admin_guide/expand/expand.ditamap" navtitle="Expanding a Greenplum System"
       format="ditamap"/>
-    <chapter href="admin_guide/managing/gpcopy-migrate.xml"/>
+    <chapter href="admin_guide/managing/gpcopy-migrate.xml" otherprops="pivotal"/>
     <chapter href="admin_guide/managing/monitor.xml" navtitle="Monitoring a Greenplum System"/>
     <chapter href="admin_guide/managing/maintain.xml" navtitle="Routine System Maintenance Tasks"/>
     <chapter href="admin_guide/monitoring/monitoring.dita"/>

gpdb-doc/dita/admin_guide/managing/partII.xml

@@ -16,7 +16,7 @@
             /></li>
           <li><xref href="backup-main.xml#backup-main"/></li>
           <li><xref href="../expand/expand-main.xml"/></li>
-          <li><xref href="gpcopy-migrate.xml"/></li>
+          <li otherprops="pivotal"><xref href="gpcopy-migrate.xml"/></li>
           <li><xref href="../ddl/ddl.xml#topic1"/></li>
           <li><xref href="maintain.xml#topic1"/></li>
         </ul></p>