RFR: 8292218: Convert PackageEntryTable to ResourceHashtable

[Coleen Phillimore]

This is the conversion of the PackageEntryTable, which is stored one per ClassLoaderData to ResourceHashtable.  Much like the module table and uses the Module_lock.
Tested with tier1-3 on linux, windows, mac.

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Commit messages:
 - Fix bug and anticipated code review comment and made ModuleEntryTable destructor look like the package one (inlined the class)
 - 8292218: Convert PackageEntryTable to ResourceHashtable

Changes: https://git.openjdk.org/jdk/pull/9837/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9837&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8292218
  Stats: 300 lines in 8 files changed: 71 ins; 133 del; 96 mod
  Patch: https://git.openjdk.org/jdk/pull/9837.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9837/head:pull/9837

PR: https://git.openjdk.org/jdk/pull/9837