RFR: 8336257: Additional tests in jmxremote/startstop to match on PID not app name [v2]

[Kevin Walls]

> Follow-on from JDK-8207908.
> 
> Two tests are broken by that change:
> sun/management/jmxremote/startstop/JMXStartStopTest.java	
> sun/management/jmxremote/startstop/JMXStatusPerfCountersTest.java
> 
> These are additional tests which use jcmd and an application name pattern to find a process.
> They should use the PID to avoid finding a process from some other concurrent test invocation.
> So it's good to have the same kind of change applied here too.

Kevin Walls has updated the pull request incrementally with one additional commit since the last revision:

  line

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Changes:
  - all: https://git.openjdk.org/jdk/pull/20138/files
  - new: https://git.openjdk.org/jdk/pull/20138/files/caaf27a0..9c025ea7

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20138&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20138&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/20138.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20138/head:pull/20138

PR: https://git.openjdk.org/jdk/pull/20138