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

[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

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Commit messages:
 - 8303102: jcmd: ManagementAgent.status truncates the text longer than O_BUFLEN

Changes: https://git.openjdk.org/jdk/pull/12724/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12724&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8303102
  Stats: 3 lines in 2 files changed: 1 ins; 0 del; 2 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