RFR: 8289939: Add flag to restrict public exponent as described in SP 800-56B [v2]

[Kevin Driver]

> [SP 800-56B](https://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-56Br2.pdf) stipulates that the publicExponent e "shall" be 65,537 ≤ e < 2^256

Kevin Driver has updated the pull request incrementally with one additional commit since the last revision:

  update copyright

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Changes:
  - all: https://git.openjdk.org/jdk/pull/9413/files
  - new: https://git.openjdk.org/jdk/pull/9413/files/102caf7d..104436b7

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=9413&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=9413&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/9413.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9413/head:pull/9413

PR: https://git.openjdk.org/jdk/pull/9413