RFR: 8306946: jdk/test/lib/process/ProcessToolsStartProcessTest.java fails with "wrong number of lines in OutputAnalyzer output" [v3]

[Leonid Mesnik]

> The ProcessTools.startProcess (...) has been updated to completely read streams after process has been completed.
> The test was updated to run 5 times with different number of lines and line sizes.

Leonid Mesnik has updated the pull request incrementally with one additional commit since the last revision:

  move buffers registration before pumping start point

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/13683/files
  - new: https://git.openjdk.org/jdk/pull/13683/files/10f1c5c2..d02b889a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13683&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13683&range=01-02

  Stats: 28 lines in 1 file changed: 10 ins; 9 del; 9 mod
  Patch: https://git.openjdk.org/jdk/pull/13683.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13683/head:pull/13683

PR: https://git.openjdk.org/jdk/pull/13683