RFR: 1052: Memory leak in RestRequestCache

[Erik Joelsson]

This patch adds a regularly scheduled cache eviction call to the RestRequestCache.

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Depends on: https://git.openjdk.java.net/skara/pull/1166

Commit messages:
 - Fixed remove loops
 - Run eviction on a separate, much longer intervall
 - SKARA-1052

Changes: https://git.openjdk.java.net/skara/pull/1167/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=1167&range=00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-1052
  Stats: 67 lines in 4 files changed: 51 ins; 3 del; 13 mod
  Patch: https://git.openjdk.java.net/skara/pull/1167.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/1167/head:pull/1167

PR: https://git.openjdk.java.net/skara/pull/1167