[jdk11u-dev] RFR: 8187522: test/sun/net/ftp/FtpURLConnectionLeak.java timed out

[Goetz Lindenmaier]

I backport this for parity with 11.0.20-oracle.

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Commit messages:
 - Backport 285fca70b4b9ffd904c55004816e88312df0247d

Changes: https://git.openjdk.org/jdk11u-dev/pull/1840/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1840&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8187522
  Stats: 41 lines in 3 files changed: 16 ins; 3 del; 22 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1840.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/1840/head:pull/1840

PR: https://git.openjdk.org/jdk11u-dev/pull/1840