RFR: 8315383: jlink SystemModulesPlugin incorrectly parses the options [v2]

[Oliver Kopp]

> Fixes https://bugs.openjdk.org/browse/JDK-8315383

Oliver Kopp has updated the pull request incrementally with one additional commit since the last revision:

  Remove obsolete imports

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Changes:
  - all: https://git.openjdk.org/jdk/pull/15495/files
  - new: https://git.openjdk.org/jdk/pull/15495/files/8fd76f62..d929f9a7

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15495&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15495&range=00-01

  Stats: 4 lines in 1 file changed: 0 ins; 4 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/15495.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15495/head:pull/15495

PR: https://git.openjdk.org/jdk/pull/15495