RFR: 8215916: The failure reason of an optional JAAS LoginModule is not logged

[Jayashree Huttanagoudar]

Could you please review the changes?
This patch is to address : https://bugs.openjdk.org/browse/JDK-8215916?jql=labels%20%3D%20starter-bug

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Commit messages:
 - 8215916: Print out more information as a part of failure reason of an optional JAAS LoginModule

Changes: https://git.openjdk.org/jdk/pull/9159/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9159&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8215916
  Stats: 6 lines in 1 file changed: 6 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/9159.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9159/head:pull/9159

PR: https://git.openjdk.org/jdk/pull/9159