RFR: 8263729: [test] Extend time to wait before destroying child in ProcssBuilder Basic test [v4]

[Roger Riggs]

> Intermittent failures on Windows in a test of destroying the child warrant extending the time the parent waits after starting the child before destroying the child.

Roger Riggs has updated the pull request incrementally with one additional commit since the last revision:

  Clarify modification of argument list after creating ProcessBuilder

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3049/files
  - new: https://git.openjdk.java.net/jdk/pull/3049/files/6313399c..31c35beb

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3049&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3049&range=02-03

  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3049.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3049/head:pull/3049

PR: https://git.openjdk.java.net/jdk/pull/3049