RFR: 8292375: Convert ProtectionDomainCacheTable to ResourceHashtable

[Coleen Phillimore]

Please review this simple conversion for the ProtectionDomainCacheTable from Old Hashtable to ResourceHashtable.  There are specific tests for this table in test/hotspot/jtreg/runtime/Dictionary and serviceability/dcmd/vm/DictionaryStatsTest.java.
Also tested with tier1-7.

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Commit messages:
 - Beef up the Test for statistics
 - 8292375: Convert ProtectionDomainCacheTable to ResourceHashtable

Changes: https://git.openjdk.org/jdk/pull/10043/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10043&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8292375
  Stats: 285 lines in 9 files changed: 84 ins; 148 del; 53 mod
  Patch: https://git.openjdk.org/jdk/pull/10043.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10043/head:pull/10043

PR: https://git.openjdk.org/jdk/pull/10043