[jdk15u-dev] RFR: 8259535: ECDSA SignatureValue do not always have the specified length

[Yuri Nesterenko]

First in a chain of updating 15u to newer Santuario. Applies cleanly but in the test printout at he line 91 must be changed for older jdk15u.

-------------

Commit messages:
 - removed trailing whitespace
 - Backport a4c249610e7c0fcc7fd863f14f51c96abc5ca39f

Changes: https://git.openjdk.java.net/jdk15u-dev/pull/161/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk15u-dev&pr=161&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8259535
  Stats: 232 lines in 4 files changed: 221 ins; 2 del; 9 mod
  Patch: https://git.openjdk.java.net/jdk15u-dev/pull/161.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk15u-dev pull/161/head:pull/161

PR: https://git.openjdk.java.net/jdk15u-dev/pull/161