Restrict the preview import vdb functionality to teiid 8+ servers

* Restores the merge method to Teiid 7 ExecutionAdmin, only allowing the
  import vdb functionality to 8+ servers.

* Merge should remain deprecated since it is only for backward compatibility

plugins/org.teiid.designer.dqp/src/org/teiid/designer/runtime/TeiidServer.java

@@ -645,4 +645,12 @@ public void update(ITeiidServer otherServer) {
         getTeiidAdminInfo().setAll(otherServer.getTeiidAdminInfo());
         getTeiidJdbcInfo().setAll(otherServer.getTeiidJdbcInfo());  
     }
+
+    @Deprecated
+    @Override
+    public void mergeVdbs( String sourceVdbName, int sourceVdbVersion, 
+                    String targetVdbName, int targetVdbVersion ) throws Exception {
+        connect();
+        admin.mergeVdbs(sourceVdbName, sourceVdbVersion, targetVdbName, targetVdbVersion);
+    }
 }

plugins/org.teiid.designer.spi/src/org/teiid/designer/runtime/spi/IExecutionAdmin.java

@@ -224,4 +224,19 @@ ITeiidDataSource getOrCreateDataSource(String displayName,
      * @throws Exception 
       */
      Driver getTeiidDriver(String driverClass) throws Exception;
+
+     /**
+      * @param sourceVdbName (excluding .vdb extension) the name of the VDB being merged into the target VDB
+      * @param sourceVdbVersion the version of the source VDB
+      * @param targetVdbName (excluding .vdb extension) the name of the VDB being merged into
+      * @param targetVdbVersion the version of the target VDB
+      * 
+      * @throws Exception if there is a problem with the merge
+      * 
+      * @deprecated This is only provided for backward compatibility with teiid 7.7.1 and should not
+      *                          be used for new code.
+      */
+     @Deprecated
+    void mergeVdbs( String sourceVdbName, int sourceVdbVersion, 
+                                 String targetVdbName, int targetVdbVersion ) throws Exception;
 }