RFR: Code cleanup before starting SKARA-1080

[Erik Joelsson]

Remove dead variables, unused imports and unused assignments before I make real changes in a followup.

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Commit messages:
 - Code cleanup before starting SKARA-1080

Changes: https://git.openjdk.java.net/skara/pull/1187/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=1187&range=00
  Stats: 46 lines in 3 files changed: 0 ins; 22 del; 24 mod
  Patch: https://git.openjdk.java.net/skara/pull/1187.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/1187/head:pull/1187

PR: https://git.openjdk.java.net/skara/pull/1187