Do not incompatibly modify SSL cert parsing failures in JavaHL.

* subversion/bindings/javahl/src/org/apache/subversion/javahl/callback/AuthnCallback.java
  (AuthnCallback.SSLServerCertFailures.ALL_KNOWN):
   Define a bitmask that includes all the failure mode bits.
  (AuthnCallback.SSLServerCertFailures.<init>):
   Check failures parameter against ALL_KNOWN, and do not modify it.
  ((AuthnCallback.SSLServerCertFailures.other):
   Also check against ALL_KNOWN to determine the result.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1603298 13f79535-47bb-0310-9956-ffa450edef68