RFR 8177334: Update xmldsig implementation to Apache Santuario 2.1.1

[Weijun Wang]

Please review the change at

  webrev: http://cr.openjdk.java.net/~weijun/8177334/webrev.00/
     CSR: https://bugs.openjdk.java.net/browse/JDK-8203460

New features include the support of SHA-224 and SHA-3 MessageMethod, and RSASSA-PSS SignatureMethods.

The change is done in 2 steps:

1. Copying files from Apache Santuario Release 2.1.1 [1]. Making cosmetic changes like changing package names.

2. More changes, including

   a. Applying patches in OpenJDK that were not pushed to Apache Santuario (yet)
   b. Using the RSASSA-PSS Signature algorithm in OpenJDK, because we don't have names like SHA256withRSAandMGF1
   c. Copying standard digest method and signature method names into public API (see the CSR)

For your convenience, there is a separate webrev for step 2 above at

   http://cr.openjdk.java.net/~weijun/8177334/changes/

Thanks
Max

[1] http://www.apache.org/dyn/closer.lua/santuario/java-library/2_1_1/xmlsec-2.1.1-source-release.zip