RFR: 8299518: HotSpotVirtualMachine shared code across different platforms [v2]

[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 refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains two new commits since the last revision:

 - separate renaming
 - 8299518: HotSpotVirtualMachine shared code across different platforms

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Changes:
  - all: https://git.openjdk.org/jdk/pull/11823/files
  - new: https://git.openjdk.org/jdk/pull/11823/files/293cccdd..cb700000

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=11823&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=11823&range=00-01

  Stats: 10 lines in 1 file changed: 0 ins; 0 del; 10 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