[jdk11u-dev] RFR: 8302069: javax/management/remote/mandatory/notif/NotifReconnectDeadlockTest.java update

[Amos Shi]

Backport of [JDK-8302069](https://bugs.openjdk.org/browse/JDK-8302069)

Testing
- Local: Test passed
  - `NotifReconnectDeadlockTest.java`: Test results: passed: 1
- Pipeline: 
- Testing Machine:

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Commit messages:
 - Backport 1c7b09bc23ac37f83b9043de35b71bea7e814da5

Changes: https://git.openjdk.org/jdk11u-dev/pull/2651/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2651&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8302069
  Stats: 16 lines in 2 files changed: 6 ins; 2 del; 8 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2651.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2651/head:pull/2651

PR: https://git.openjdk.org/jdk11u-dev/pull/2651