RFR: 8215916: The failure reason of an optional JAAS LoginModule is not logged [v6]

[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

Jayashree Huttanagoudar has updated the pull request incrementally with one additional commit since the last revision:

  Address review comment for test case

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Changes:
  - all: https://git.openjdk.org/jdk/pull/9159/files
  - new: https://git.openjdk.org/jdk/pull/9159/files/a7997f05..704cfefd

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=9159&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=9159&range=04-05

  Stats: 16 lines in 1 file changed: 10 ins; 5 del; 1 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