RFR: 8207166: jdk/jshell/JdiHangingLaunchExecutionControlTest.java - launch timeout

[Daniel D. Daugherty]

A trivial fix to scale time values for HangingRemoteAgent.java by JTREG timeoutFactor.
Also cleaned up an incorrect comment.

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Commit messages:
 - 8207166: langtools/jdk/jshell/JdiHangingLaunchExecutionControlTest.java - launch timeout

Changes: https://git.openjdk.org/jdk/pull/10049/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10049&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8207166
  Stats: 9 lines in 2 files changed: 3 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/10049.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10049/head:pull/10049

PR: https://git.openjdk.org/jdk/pull/10049