RFR: 8155246: Throw error if default java.security file is missing

[Sean Coffey]

In the broken case where the conf/security/java.security configuration file doesn't exist, the JDK should throw an Error. 

CSR in progress.

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Commit messages:
 - Update bug summary in test
 - 8155246

Changes: https://git.openjdk.org/jdk/pull/9747/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9747&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8155246
  Stats: 119 lines in 3 files changed: 101 ins; 17 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/9747.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9747/head:pull/9747

PR: https://git.openjdk.org/jdk/pull/9747