RFR: 8282632: Cleanup unnecessary calls to Throwable.initCause() in java.security.jgss

[Andrey Turbanov]

Pass cause exception as constructor parameter is shorter and easier to read.

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Commit messages:
 - [PATCH] Cleanup unnecessary calls to Throwable.initCause() in java.security.jgss

Changes: https://git.openjdk.java.net/jdk/pull/7682/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7682&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8282632
  Stats: 22 lines in 3 files changed: 0 ins; 13 del; 9 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7682.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7682/head:pull/7682

PR: https://git.openjdk.java.net/jdk/pull/7682