[11u,13u] RFR: backport of 8231507: Update Apache Santuario (XML Signature) to version 2.1.4

[Fedor]

Hello all,

I would like to ask for review backport of JDK-8231507 (Update Apache 
Santuario (XML Signature) to version 2.1.4)

bug: https://bugs.openjdk.java.net/browse/JDK-8231507
webrev: http://cr.openjdk.java.net/~fijiol/8231507/webrev.13u.00/
tests: test/jdk/com/sun/org/apache/xml/ test/jdk/javax/xml/crypto/dsig/

It mostly applied cleanly, the only merge-conflict was in comments of 
XMLDSigRI.java file, which was updated as in jdk14:

 >>>>>>>>>>>>>>>>
@@ -134,7 +134,8 @@
      }

      public XMLDSigRI() {
-        /* We are the XMLDSig provider */
+        // This is the JDK XMLDSig provider, synced from
+        // Apache Santuario XML Security for Java, version 2.1.4
          super("XMLDSig", VER, INFO);

          final Provider p = this;
 >>>>>>>>>>>>>>>>


Thanks,
Fedor