[jdk11u-dev] RFR: 8211343: nsk_jvmti_parseoptions should handle multiple suboptions

[luchenlin]

I backport this for parity with 11.0.20-oracle.

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Commit messages:
 - Backport 32a5512763b4e0498e3a4843bc516d93d2859a1c

Changes: https://git.openjdk.org/jdk11u-dev/pull/1929/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1929&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8211343
  Stats: 99 lines in 2 files changed: 17 ins; 53 del; 29 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1929.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/1929/head:pull/1929

PR: https://git.openjdk.org/jdk11u-dev/pull/1929