Change the method setXmlNamespaceConfig from static to non-static. Th…

…is fix an issue that a bean is not writtable after we upgraded spring. It seems the change doesn't cause any issues in the project.

src/main/java/org/dataone/cn/indexer/parser/BaseXPathDocumentSubprocessor.java

@@ -166,7 +166,7 @@ public void setMatchDocuments(List<String> matchDocuments) {
         this.matchDocuments = matchDocuments;
     }
 
-    public static void setXmlNamespaceConfig(XMLNamespaceConfig xmlNamespaceConfig) {
+    public void setXmlNamespaceConfig(XMLNamespaceConfig xmlNamespaceConfig) {
         xpath.setNamespaceContext(xmlNamespaceConfig);
     }