RFR: 8281631: HashMap copy constructor and putAll can over-allocate table [v28]

[XenoAmess]

> 8281631: HashMap copy constructor and putAll can over-allocate table

XenoAmess has updated the pull request incrementally with five additional commits since the last revision:

 - clean out tests
 - Remove 'randomness' keyword.
 - Cleanup and commenting.
 - initial rewrite of WhiteBoxResizeTest
 - Restore WhiteBoxResizeTest.java

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7431/files
  - new: https://git.openjdk.java.net/jdk/pull/7431/files/49aeef20..11a57a2d

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7431&range=27
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7431&range=26-27

  Stats: 845 lines in 6 files changed: 311 ins; 534 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7431.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7431/head:pull/7431

PR: https://git.openjdk.java.net/jdk/pull/7431