RFR: 8299518: HotSpotVirtualMachine shared code across different platforms [v4]

[Yi Yang]

> harmless refactor to share code across different platforms of VirtualMachineImpl:
> 1. Shared code to process command response after requesting a command execution
> 2. Read functionality in SocketInputStream can be reused

Yi Yang has updated the pull request incrementally with two additional commits since the last revision:

 - describe parameter
 - Revert "separate renaming"
   
   This reverts commit cb700000ac62fdfa605ed4f9e415c4ab73bfc8a3.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/11823/files
  - new: https://git.openjdk.org/jdk/pull/11823/files/0580ab2d..e9d8c36f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=11823&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=11823&range=02-03

  Stats: 69 lines in 4 files changed: 2 ins; 0 del; 67 mod
  Patch: https://git.openjdk.org/jdk/pull/11823.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11823/head:pull/11823

PR: https://git.openjdk.org/jdk/pull/11823