SOLR-4893: Extend FieldMutatingUpdateProcessor.ConfigurableFieldNameSelector to enable checking whether a field matches any schema field. (merged trunk r1491102)

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1491109 13f79535-47bb-0310-9956-ffa450edef68