RFR: 8303102: jcmd: ManagementAgent.status truncates the text longer than O_BUFLEN [v2]

[Sergey Bylokhov]

> Implementation of the "ManagementAgent.status" indirectly depends on the size of "O_BUFLEN".
> 
> The root cause is usage of [print_cr()](https://github.com/openjdk/jdk/blob/master/src/hotspot/share/utilities/ostream.cpp#L153) which may [truncate](https://github.com/openjdk/jdk/blob/master/src/hotspot/share/utilities/ostream.cpp#L101) the output.
> 
> The solution is similar to the [JDK-8263640](https://bugs.openjdk.org/browse/JDK-8263640). see discussion about that approach https://github.com/openjdk/jdk/pull/4616

Sergey Bylokhov has updated the pull request incrementally with one additional commit since the last revision:

  Update JMXStatusTest.java

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/12724/files
  - new: https://git.openjdk.org/jdk/pull/12724/files/23422bc0..99aef33c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12724&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12724&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/12724.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12724/head:pull/12724

PR: https://git.openjdk.org/jdk/pull/12724