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To support Windows node in remote mode, this PR adds a layer of commands (osCommands) to deal difference between Windows and Unix-like OS. To share code, ShellExecutor is added to enrich original SshClient class.

I will implement windows version commands in next phase.

This pattern can be expanded to Local or other platform in future, so I moved related code to common folder for sharing.

Add shell support for ssh connection, so that remote script can be started with user environment.

Minor fixes,

1. Fix gpu_metrics_collector to support pyenv. As pyenv will create one more process, so that original pgrep code always got extra processes, and cannot start gpu_metrics_collector.
2. Fix NASUI failure on dev-install-node-modules, to create subfolder every time.
3. Fix MakeFile to reduce mis-created links, and other minor issues.
4. Add node --watch for nni_manager for better dev experience.

Bumps [acorn](https://github.com/acornjs/acorn) from 6.4.0 to 6.4.1.
- [Release notes](https://github.com/acornjs/acorn/releases)
- [Commits](https://github.com/acornjs/acorn/compare/6.4.0...6.4.1

)
Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* support final result is NaN in webui

* delete unuseful change

* show NaN rather than NaN(latest)
Co-authored-by: Lijiao <15910218274@163.com>

* add warning message when final data illegal

* update

* update

* update

* fix comments
Co-authored-by: Lijiao <15910218274@163.com>

* rename intermediate graph xAxis name

* rename intermediate name

* code format

* rename class name
Co-authored-by: Lijiao <15910218274@163.com>

Co-authored-by: Lijiao <15910218274@163.com>

Remove final val in the intermediate result graph and fix layout style bug(table | search space | config) on desktop (#2111)

* fix bug of !(object) !(number) metris

* fix comments
Co-authored-by: Lijiao <35484733+lvybriage@users.noreply.github.com>