RFR: 8305343: BigDecimal.fractionOnly() erroneously returns true for large scale value

[Raffaello Giulietti]

A fix for the issue and additional specific tests.

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Commit messages:
 - 8305343: BigDecimal.fractionOnly() erroneously returns true for large scale value

Changes: https://git.openjdk.org/jdk/pull/13326/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13326&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8305343
  Stats: 36 lines in 2 files changed: 31 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/13326.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13326/head:pull/13326

PR: https://git.openjdk.org/jdk/pull/13326